Lynch made her televised in-ring debut on 26 June 2014 episode of NXT, defeating Summer Rae. The next week, Lynch teamed up with Bayley in a losing effort to the BFFs: Beautiful Fierce Females (NXT Women's Champion Charlotte and Sasha Banks) in a tag team match. Lynch spent the next few months competing in non-title matches against Charlotte, losing three in a row. On 23 October episode of NXT, after being told to make herself relevant, Lynch aligned herself with Banks by attacking Bayley, turning heel. Known as Team B.A.E. (Best at Everything), the alliance started to disintegrate when Banks cost Lynch a match against Bayley in February 2015.
At NXT TakeOver: Rival, Lynch participated in a fatal four-way match for the NXT Women's Championship, which was won by Banks. In April, Lynch defeated Bayley and Charlotte in a triple threat match to earn a title match against Sasha, which she lost at NXT TakeOver: Unstoppable. During the match, she debuted a new look. The match received widespread critical acclaim, with praise going to both performers.
Lynch made her official main roster debut the on 13 July episode of Raw, as a fan favorite, along with Charlotte and Sasha Banks, after Stephanie McMahon called for a "revolution" in the WWE Divas division. Lynch and Charlotte began allying with Paige, who was feuding with Team Bella (Alicia Fox and The Bella Twins), while Banks allied with Naomi and Tamina, leading to a brawl between the three teams. The trio of Paige, Lynch and Charlotte, originally dubbed Submission Sorority, was renamed to Team PCB (after the initials of each wrestler). Lynch made her in-ring debut on 20 July episode of Raw, teaming with Paige in a losing effort against Sasha Banks and Naomi. She earned her first singles victory on 28 July episode of Main Event over Brie Bella. The three teams ultimately faced off at SummerSlam in a three-team elimination match, in which Lynch pinned Brie Bella to win the match for PCB.
On 31 August episode of Raw, all members of PCB competed in the inaugural "Divas Beat the Clock challenge", to determine the number one contender for the Divas Championship. Charlotte won the match and went on to claim the title from Nikki Bella at Night of Champions on 20 September. The following night on Raw, Paige turned on her partners during Charlotte's celebration, claiming that Charlotte was only there because of her father Ric Flair (since he was a former wrestler in WWE) and called Lynch the "least relevant" member of the group. Throughout October, Paige tried to reconcile with Lynch and Charlotte only to attack them, officially disbanding Team PCB in the process. On 2 November episode of Raw, Lynch was pinned by Paige in a fatal four-way to earn a title match for Charlotte's Divas Championship. The following week on Raw, Lynch gained revenge by defeating Paige.
On 30 November episode of Raw, Charlotte started displaying villainous traits after she feigned a leg injury to defeat Lynch, followed by a distraction provided by her father. Throughout December, the two's friendship continued to strain and after Lynch defeated her on 4 January 2016 episode of Raw, Charlotte attacked her and solidified her heel turn. Lynch faced Charlotte for the Divas Championship three days later on SmackDown and at the Royal Rumble pay-per-view event, but lost both matches after interference from Ric Flair.
Throughout February, Lynch began teaming with Banks against Naomi and Tamina. Their feud continued until Lynch and Banks came victorious in a tag team match at Fastlane. The following night on Raw, a number one contender's match for the Divas Championship between Lynch and Banks ended in a double pin (both wrestlers pinning each other simultaneously). A rematch on the following SmackDown ended in a no contest when Diva's Champion Charlotte attacked both contestants. As a result, Charlotte was scheduled to defend her title in a triple threat against both wrestlers at WrestleMania 32. At the event, Lynch was unsuccessful in capturing the newly-created WWE Women's Championship (which replaced the Diva's Championship). At Money in the Bank in June, Lynch teamed up with Natalya to face Dana Brooke and Charlotte in a losing effort. After their match, Natalya turned on Lynch and attacked her. The two began feuding for a month until Lynch lost to Natalya at Battleground.
After being the first woman drafted to the SmackDown brand during the 2016 WWE draft, Lynch defeated Natalya in her first match as part of the brand. At SummerSlam, Lynch teamed up with Carmella and Naomi in a six–woman tag team match in a losing effort against Alexa Bliss, Natalya and Nikki Bella.
On 11 September, at Backlash, Lynch won a six-pack elimination challenge, last eliminating Carmella, to become the inaugural SmackDown Women's Champion. Her first title defense against Alexa Bliss was scheduled for No Mercy but due to a legitimate injury the match was postponed to 8 November episode of SmackDown; Lynch successfully defended the title by submission. At the Survivor Series event, Lynch was the last woman from Team SmackDown to be eliminated during the 5-on-5 Survivor Series elimination match against Team Raw. At the TLC: Tables, Ladders & Chairs pay-per-view in December, Lynch lost the SmackDown Women's Championship to Bliss in a tables match, ending her reign at 84 days. Two weeks later on SmackDown, Lynch masked herself as La Luchadora and defeated Bliss in a non-title match. She received her championship rematch on 17 January 2017 episode of SmackDown, in a steel cage match but lost after interference from another La Luchadora (later revealed as the returning Mickie James). On 21 February episode of Smackdown, Lynch again failed to capture the championship. Lynch participated in a six-pack challenge for the title at WrestleMania 33 in April, which was ultimately won by Naomi.
In May, Lynch aligned with Naomi and Charlotte Flair against The Welcoming Committee (Natalya, Carmella and Tamina). The two teams faced off in a six-woman tag team match at Backlash; the Welcoming Committee was victorious when Lynch submitted to Natalya's sharpshooter. Shortly after, Lynch competed at Money in the Bank, as part of the first women's money in the bank ladder match, which was won by Carmella. In October, Lynch won a fatal five-way match against Flair, Naomi, Tamina and Carmella to become the Team SmackDown's captain for Survivor Series. At the event, Lynch was the first competitor eliminated and her team was on the losing side. Throughout the rest of the year, Lynch again aligned with Flair and Naomi to feud with the debuting Riott Squad (Ruby Riott, Liv Morgan and Sarah Logan). In January 2018, at the Royal Rumble, Lynch participated in the first women's Royal Rumble match, entering at number 2 and lasting over 30 minutes before being eliminated by Ruby Riott. A few months later, Lynch also participated in the WrestleMania Women's Battle Royal at WrestleMania 34, but was eliminated from the match by James. In May, she qualified for the women's Money in the Bank ladder match, which was ultimately won by Bliss.
Following the 2018 Money in the Bank event, Lynch began a winning streak, defeating different competitors such as Billie Kay, Sonya Deville, Peyton Royce, Mandy Rose, and SmackDown Women's Champion Carmella in a non-title match. The wins earned Lynch a title match at SummerSlam, with Charlotte Flair being added to the match as well after she also defeated Carmella in a non-title match. Flair went on to win the title by pinning Lynch, who was about to submit Carmella. After the match, Lynch attacked Flair, turning heel for the first time on the main roster. Two days later on SmackDown, Lynch berated the crowd, claiming that they were not really supporting her the whole time, and that she was being denied opportunities which were always handed to Flair. Despite this, audiences increasingly supported Lynch, leading WWE to tweak the storyline and portray both Lynch and Flair as both having valid points, but neither being outright heels. The feud between the two led to a title match at Hell in a Cell, in which Lynch won the SmackDown Women's Championship for a second time. In October, Lynch retained her title against Flair in two different matches both at Super Show-Down and on an episode of SmackDown by a disqualification loss and a double count-out, respectively. As a result, a last woman standing match between the two was scheduled for Evolution, where Lynch emerged victorious after powerbombing Flair from the top turnbuckle through a table. Around this time, Lynch started using the nickname "The Man", claiming to be the top wrestler of the company.
As part of a competition between the Raw and SmackDown brands at Survivor Series, Lynch was scheduled for an interbrand champion vs. champion match against Raw Women's Champion Ronda Rousey. Lynch led an invasion on 12 November episode of Raw and during that angle, she suffered a legit concussion and broken nose following a stiff punch from Nia Jax. Due to the injury, Lynch was pulled from the match with Rousey and named Flair as her replacement on the following night's episode of SmackDown. After her return, Lynch defended her title in a Tables, Ladders and Chairs match against both Flair and Asuka at TLC, where Asuka won the title after Rousey interfered and pushed both Lynch and Flair off a ladder, ending her second reign at 91 days.
On 27 January 2019, at the Royal Rumble event, Lynch was unsuccessful in regaining the title from Asuka. Later that night, she participated in the women's Royal Rumble match, replacing an injured Lana, who was the 28th entrant. Lynch would go on to win with lastly eliminating Charlotte Flair. The following night on Raw, Lynch once again continued her feud with Ronda Rousey, choosing to face Rousey for the Raw Women's Championship at WrestleMania 35. As part of a storyline in which she refused to seek medical attention on her knee and attacked Stephanie McMahon and Triple H, Vince McMahon suspended Lynch in February for 60 days and replaced her with Charlotte Flair as Rousey's WrestleMania opponent. Due to pleadings from Rousey, Lynch was reinstated by Stephanie, and at the Fastlane event, she defeated Flair via disqualification after Rousey purposely attacked Lynch to give her the win; due to the stipulation of the match, Lynch was added back into the title match at WrestleMania to make it a triple-threat match for the Raw Women's Championship. Flair then won the SmackDown Women's Championship from Asuka, making the WrestleMania match a Winner Takes All match for both titles. At the event, in what was the first time women main evented a WrestleMania, Lynch controversially pinned Rousey to win both titles. The commentary and production team commented that Rousey's shoulders were not down for the three-count and many fans and media were left wondering if this was a legitimate botched finish. Nonetheless, with the win, Lynch gave Rousey her first WWE singles and pinfall loss and became a double champion and the only woman to hold both titles simultaneously. With both titles, she was allowed to appear on both the Raw and SmackDown brands and got another nickname, "Becky Two Belts".
Shortly after WrestleMania, Lynch was placed in a feud with Lacey Evans, who was drafted to Raw during the Superstar Shake-up and who continuously attacked Lynch after her promos. Simultaneously on SmackDown, Lynch continued her feud with Flair over the SmackDown Women's Championship. At Money in the Bank, Lynch retained the Raw Women's Championship over Evans, but lost the SmackDown Women's Championship to Flair in the following match due to an interference by Evans. With the loss of the SmackDown Women's Championship, Lynch became a member of the Raw brand. Lynch again retained the title over Evans at Stomping Grounds and on the same night helped Universal Champion and real-life boyfriend Seth Rollins retain his title over Baron Corbin after Corbin chose Evans as the guest referee for his match. Lynch teamed up with Rollins and defeated Corbin and Evans at Extreme Rules in a winner-takes-all mixed tag-team match. Lynch successfully defended her title at SummerSlam against Natalya in a submission match. At Clash of Champions, Lynch defended against the returning Sasha Banks, but was disqualified after accidentally striking an official with a steel chair, thus retaining her title. The feud between the two women eventually led to the second-ever women's hell in a cell match, which was took place on 6 October, at the namesake pay-per-view, in which Lynch was once again victorious. At Survivor Series, Lynch faced SmackDown Women's Champion Bayley and NXT Women's Champion Shayna Baszler in a non-title triple threat match to determine the superior women's champion. Baszler emerged victorious by submitting Bayley while Lynch was downed at ringside. Following the match, Lynch attacked Baszler and put her through an announce table. After the event, Lynch became the longest reigning Raw Women's Champion, surpassing Ronda Rousey's record of 232 days. At WrestleMania 36, Lynch retained once again against Baszler. On the May 11 episode of Monday Night Raw, Lynch made the announcement that she had relinquished the Raw Women's Title due to her pregnancy, and that the women's Money in the Bank ladder match - which was won by Asuka - was actually for the Raw Womens Championship.
On August 21, 2021, following a fifteen-month hiatus, Lynch made her return at SummerSlam, defeating Bianca Belair in less than half a minute to win the SmackDown Women's Championship for the fourth time. Before that, Lynch sucker-punched Belair when the latter offered a pre-match handshake, thus turning heel for the first time since 2018. In the following weeks, Lynch refused a rematch, and attacked Belair during the latter's homecoming celebration, cementing her heel turn. At Extreme Rules, her match with Belair ended in a no contest after Sasha Banks interfered and attacked both of them. As a part of the 2021 Draft, Lynch was drafted to the Raw brand as SmackDown Women's Champion. A triple threat match between the Lynch, Belair, and Banks for the SmackDown Women's Championship was then scheduled for the Crown Jewel event in October, where Lynch successfully retained her title. On the October 22 episode of SmackDown, Lynch and Flair exchanged their titles, thus Lynch became Raw Women's Champion. On the November 1 episode of Raw, Lynch successfully defended her title against Bianca Belair. At Survivor Series, Lynch defeated SmackDown Women's Champion Charlotte Flair in a champion versus champion match. On the January 31, 2022 episode of Raw, Lynch would confront Royal Rumble winner Ronda Rousey, but was dropped by Rousey as she left the ring. She would then be confronted by Lita, who would challenge Lynch to a title match at Elimination Chamber for the Raw Women's Championship, which Lynch would accept. At the event, Lynch would retain against Lita. On night one of WrestleMania 38, Becky Lynch lost her title to Bianca Belair.
On the April 25 episode of Raw, Lynch was confronted by a returning Asuka, reigniting their feud. On the May 16 episode of Raw, Lynch failed to become the number one contender for the Raw Women's Championship by losing to Asuka. The next week, Lynch defeated Asuka to be added to the match between her and Belair at Hell in a Cell, making it a triple threat match. At the event, Belair retained her title. On the June 20 episode of Raw, Lynch failed to qualify for the women's Money in the Bank ladder match after losing to Asuka. However, Lynch won a last chance Money in the Bank qualifying six-pack elimination match on the following episode of Raw. At Money in the Bank, she was unsuccessful in winning the match. At SummerSlam, Lynch failed to regain the Raw Women's Championship from Belair, but embraced her after the match, turning face in the process. After Belair was confronted by a returning Bayley and new allies Dakota Kai and Iyo Sky (formerly Io Shirai), Lynch aided Belair, cementing her face turn. On August 1, WWE issued a statement regarding Lynch suffering a separated shoulder in her match at SummerSlam. On the November 25 episode of SmackDown, Lynch made her return, being revealed as the fifth and final member of Bianca Belair's team for Survivor Series WarGames. At the event, her team would be successful. At the Royal Rumble on January 28, 2023, Lynch entered the women's Royal Rumble match at number fifteen. She eliminated Dakota Kai and Iyo Sky before being eliminated by Bayley.
On the February 27 episode of Raw, Lynch and Lita defeated Damage Control to win the WWE Women's Tag Team Championships with the help of returning Trish Stratus; Lynch also became the sixth women's Triple Crown winner with this win. On Night One of WrestleMania 39, Lynch, Lita, and Stratus defeated Damage Control. On the April 10 episode of Raw, she and Stratus (replacing an injured Lita) dropped the titles to Liv Morgan and Raquel Rodriguez, ending Lynch and Lita's reign at 43 days. Stratus then turned on Lynch and attacked her afterwards. On the May 15 episode of Raw, Lynch challenged Stratus to a singles match at Night of Champions. Lynch lost the match after Zoey Stark interfered and Stratus pinned her. On the June 5 episode of Raw, Lynch defeated Sonya Deville to qualify for the titular Money in the Bank on July 1, which was won by Iyo Sky. Lynch eventually earned a rematch against Stratus by defeating Zoey Stark in singles action on Raw, which was scheduled by WWE Official Adam Pearce for a future episode occurring two weeks later. On August 15, Stratus and Lynch's match ended in a double countout. Adam Pearce declared that the two would have a future rematch inside of a steel cage, which would be a first for Stratus, at Payback. Stratus, who was aided by Stark, ended up losing the match at Payback. After the match, Stark turned on Stratus after Stratus slapped and berated Stark.
Following this, Lynch began a feud with NXT Women's Champion Tiffany Stratton and challenged her to a title match, which Stratton accepted. On the September 12 episode of NXT, Lynch defeated Stratton to win the title, becoming the sixth women's Grand Slam Champion in the process. At NXT No Mercy, Lynch defeated Stratton in an Extreme Rules match in the main event to retain the title. On night one of NXT Halloween Havoc on October 24, Lynch lost the title to Lyra Valkyria, ending her reign at 42 days. On the November 17 episode of SmackDown, Lynch was announced as the fourth and final member of Bianca Belair's team at Survivor Series WarGames. At the event on November 25, Lynch, Belair, Charlotte Flair and Shotzi defeated Damage Control (Bayley, Iyo Sky, Kairi Sane and Asuka) after Lynch pinned Bayley. Afterwards, Lynch reignited her feud with Nia Jax, which culminated in a match at Raw Day 1, where Lynch was defeated by Jax.
At the Royal Rumble on January 27, 2024, Lynch entered the Royal Rumble match at number twenty-one and eliminated Chelsea Green before being eliminated by the debuting Jade Cargill. On the February 5 episode of Raw, Lynch defeated Shayna Baszler to qualify for the women's Elimination Chamber match at Elimination Chamber: Perth, which Lynch won by last eliminating Liv Morgan, earning a Women's World Championship match against Rhea Ripley at WrestleMania XL. On night one of WrestleMania XL on April 6, Lynch failed to win the title from Ripley. However, after Ripley was forced to vacate the title due to injury on the April 15 episode of Raw, Lynch would win the title in a women's battle royal the following week. At King and Queen of the Ring on May 25, Lynch lost the title to Liv Morgan after accidental interference from Dominik Mysterio, ending her reign at 33 days. Two nights later on Raw, Lynch failed to regain the title from Morgan in a steel cage match after another accidental interference from Mysterio.
On April 20, 2025, during night two of WrestleMania 41, Lynch returned from an eleven-month hiatus as the tag team partner for Lyra Valkyria (in place of the injured Bayley), defeating WWE Women's Tag Team Champions Liv Morgan and Raquel Rodriguez to win the titles for the second time. On the following episode of Raw, the duo lost the titles back to Morgan and Rodriguez, ending their reign at only one day. After the match, Lynch attacked Valkyria, turning heel for the first time since 2022. On the April 28 episode of Raw, Lynch revealed that she was the one that attacked Bayley before WrestleMania. At Backlash on May 10, Lynch failed to win the Women's Intercontinental Championship from Valkyria. At Money in the Bank on June 7, Lynch defeated Valkyria in a Last Chance match to win the title. On the June 23 episode of Raw, Lynch defeated Bayley to retain the title via disqualification after being attacked by Valkyria. At Evolution on July 13, Lynch retained the title against Bayley and Valkyria in a triple threat match. On night two of SummerSlam on August 3, Lynch retained the title against Valkyria in a no disqualification Last Chance match, subsequently ending their feud.
At Clash in Paris on August 31, Lynch successfully defended the title against Nikki Bella. Later that night, Lynch helped her husband Seth Rollins retain the World Heavyweight Championship. At Wrestlepalooza on September 20, she teamed with Rollins against CM Punk and the returning AJ Lee in a mixed tag team match in a losing effort. On the November 17 episode of Raw, thanks to a distraction from Lee, she lost the Women's Intercontinental Championship to Maxxine Dupri, ending her record-setting reign at 163 days.