Bethany Platt is a fictional character from the British ITV soap opera Coronation Street. She was born on-screen during the episode broadcast on 4 June 2000. She was played by Mia Cookson in 2000 and by twins Amy and Emily Walton from 2000 until 30 December 2007, when the character departed. The character was reintroduced with Lucy Fallon taking over the role, and Bethany made her return on 20 March 2015. On 2 May 2019, Fallon announced that she had quit the show. She filmed her last scene on 16 January 2020 and Bethany departed on 4 March 2020. In August 2023, it was announced that Fallon would be reprising the role after three years away. Bethany returned on 31 December 2023. In February 2025, Fallon went on maternity leave after the birth of her second child. Departing on 10 February and returning on 3 October.

Bethany is the daughter of established character Sarah Platt (Tina O'Brien) and her classmate Neil Fearns (Paul Holowaty), half-sister of Billy and Harry Platt, granddaughter of Gail Platt (Helen Worth) and Brian Tilsley (Christopher Quinten), and great-granddaughter of Audrey Roberts (Sue Nicholls). Bethany's storylines have included her taking ecstasy tablets when her uncle, David Platt (Jack P. Shepherd), hid them in her doll. Bethany departed Weatherfield with her mother Sarah for a new life in Milan. Her return storyline saw her running away from home in Milan back to Weatherfield, and since then, her storylines have included the character's infatuation with David's enemy Callum Logan (Sean Ward) in the midst of his conflict against her family; being a victim of school bullying; developing a crush on her mother's boyfriend Gary Windass (Mikey North); her dangerous relationship with local pimp boss Nathan Curtis (Christopher Harper), who subjugates Bethany in child grooming and sexual exploitation; becoming a lapdancer in the follow-up of her grooming ordeal, which involves building a friendship with Craig Tinker (Colson Smith); being stalked and kidnapped by the daughter, Kayla Clifton (Mollie Winnard), of one of the men who abused her; dating Ryan Connor (Ryan Prescott); and helping her colleague Daniel Osbourne (Rob Mallard) with the death of his wife Sinead (Katie McGlynn) and falling in love with him. She left Weatherfield to start a new life in London, before returning three years later. Since her return her storylines have focused on reconciling her relationship with Daniel, a short feud with Daniel’s love interest Daisy Midgeley (Charlotte Jordan), involvement in the disappearance of Lauren Bolton (Cait Fitton), being diagnosed with sepsis after flying to Turkey to have cosmetic surgery done, resulting in Bethany being left with a lifelong colostomy bag.

Amy and Emily Walton shared the role of Bethany from the character's birth in 2000 until 2007 when Tina O'Brien chose to quit. Mia Cookson also played the role of Bethany alongside the Walton twins in 2000. On 23 October 2014, it was announced that Bethany, now 14 years old, would return to the show. Katie Redford was initially cast in the role, but was sacked just days later before filming began after it was revealed that she was 25 years old, not 19 as she and her management had claimed. On 29 January 2015, Blackpool-born Lucy Fallon was confirmed as her replacement. She returned on 20 March 2015.

Bethany is introduced in 2000 when the show tackled the controversial subject of teenage pregnancy, using the character of 13-year-old Sarah Platt, recently recast to 16-year-old Tina O'Brien. The storyline was praised by health minister Yvette Cooper, saying "we need to make sure that young people themselves are aware of just how easy it is to get pregnant and just how hard it is to be a parent, if we are to get teenage pregnancy rates down" and praised Granada TV "on having the courage to include a storyline in Coronation Street about teenage pregnancy."

In 2007, a storyline involving Bethany's uncle, David Platt, planting ecstasy tablets in one of her toys and Bethany accidentally taking drugs was revealed. Of the storyline, Jack P. Shepherd commented "I was quite excited because I've not really done emotional stuff before. I've done little bits but this is a huge storyline. It's a character change for David. The only way David knows how to get attention is by doing bad things. It's the only time when people sit up and listen." Executive producer Kieran Roberts said "We didn't set out to do a story about the danger of drugs, but we have got responsibilities and if we can send out a useful message, in this case that drugs can be very dangerous, then that is all well and good."

With the announcement of Sarah's return soon came the announcement of her daughter Bethany's return with actress Katie Redford being cast in the role. Speaking of the announcement, Redford said: "Until I'm actually on set, I genuinely don't think it will sink in that I'm joining the cast of Coronation Street. I know it sounds clichéd but it really feels like a dream come true. Bethany Platt is going to be such a fun and witty character to play and I hope everyone enjoys her return as much as I'm going to!" It was later revealed that Redford would be replaced in the role of Bethany with Lucy Fallon taking over the role. Speaking of her casting, Fallon commented: "Walking onto the set was surreal and nerve-wracking, but everyone has been really welcoming and I am thrilled to have been given this great opportunity." Bethany made her return on-screen on 20 March 2015, and Sarah made her return on 30 March 2015.

In February 2015, producer Stuart Blackburn revealed that Sarah would embark on a relationship with Callum Logan, portrayed by Sean Ward, who is the ex-boyfriend of David's wife, Kylie Platt, portrayed by Paula Lane, and the arch-enemy of David. "David's got massive problems, because over the weeks Callum's taken a real liking to Max and Max is actually his biological son," Blackburn told ITV. "And he's got almost as many rights to Max as David does. On the seemingly good news front is the return of Bethany and Sarah, but very quickly Callum takes a real liking to Sarah. It's a liking that is returned, so huge problems for David!" Bethany also has a crush on Callum and Callum uses this to his advantage. Blackburn said "Sarah Lou is involved with Callum and her daughter Bethany also has a crush on him. Callum will use this crush and Bethany will become his insurance policy if things go wrong. Bethany thinks she is grown up, but she is just a 15-year-old kid. She is naive and she is going to get in a world of trouble because of her involvement with Callum."

In December 2016, it was announced that Bethany would be "gradually groomed into a world of sexual exploitation" after "falling for charming" Nathan Curtis (Christopher Harper) in a storyline starting in early 2017. The storyline intends "to raise awareness of the dangers out there as well as breaking the stereotypes of the perpetrators and victims that exist." Harper said that "it's very interesting to have someone as bright and cynical as Bethany be duped by this adult who is manipulating her" and "child exploitation isn't just about what is happening to young children – that emotional hotpot we all remember of being 16, 17, 18 years of age, being clever, being open but also still vulnerable. And that’s where Bethany is."