Gail Platt (also Potter, Tilsley, Hillman, McIntyre, Rodwell and Chadwick) is a fictional character from the British ITV soap opera Coronation Street, played by Helen Worth. The character first appeared on-screen on 29 July 1974. Gail is the daughter of Audrey Roberts (Sue Nicholls) and Ted Page (Michael Byrne) and is the mother of Nick Tilsley (Ben Price), Sarah Platt (Tina O'Brien) and David Platt (Jack P. Shepherd) and has featured in some of the most controversial and high-profile storylines in the soap involving her family and her number of relationships – she is the soap's most married female character, having been married seven times (equal to Steve McDonald (Simon Gregson)). In June 2024, it was announced that Worth had decided to leave Coronation Street after nearly 50 years. She made her on-screen departure from the soap in December of that year. Worth reprised the role for a one-off at Christmas 2025, a year after her departure.

Gail's storylines include her marriage to Brian Tilsley (Christopher Quinten); her vicious feud with her mother-in-law Ivy Tilsley (Lynne Perrie); her affair with Brian's cousin Ian Latimer (Michael Loney); coping when Brian is killed in a knife attack; marrying the much younger Martin Platt (Sean Wilson); coping when her teenage daughter Sarah gets pregnant at the age of 13; divorcing Martin after he has an affair with his colleague Rebecca Hopkins (Jill Halfpenny); marrying Richard Hillman (Brian Capron), who she discovers is a serial killer; being kidnapped with Sarah, David and her granddaughter Bethany Platt (Emily and Amy Walton) by Richard and being driven into the canal by him; her feud with Eileen Grimshaw (Sue Cleaver) after her son Todd (Bruno Langley) comes out as gay while dating Sarah; throwing David out after he hides drugs in Bethany's toys; being pushed down the stairs by David after he discovers that she took Tina McIntyre (Michelle Keegan) to a private abortion clinic to terminate a pregnancy fathered by David; marrying Tina's father Joe McIntyre (Reece Dinsdale); being imprisoned for Joe's murder when his plan to fake his own death goes wrong; a relationship with Audrey's ex-partner Lewis Archer (Nigel Havers) only for him to con her out of all her money; a feud with David's wife Kylie Turner (Paula Lane); coping with the secret that Kylie slept with Nick and that her unborn baby may not be David's; marrying the burglar who robbed her home, Michael Rodwell (Les Dennis); keeping the secret that Andy Carver (Oliver Farnworth) is not actually Michael's son but an impostor; trying to help David come to terms with Kylie's death; locking David in the cellar of the Bistro after discovering that he is going to kill Kylie's murderer, Clayton Hibbs (Callum Harrison); dealing with Bethany's involvement in a sex ring; discovering that David has fallen in love with Shona Ramsey (Julia Goulding), the mother of Clayton.

Actress Helen Worth was cast as Gail Potter in 1974. The role of Gail was initially intended to be very minor, a friend of the more established character Tricia Hopkins (Kathy Jones), who was introduced as part of a new family. The Hopkins family made little impact on the show, and, after they were written out, Gail went on to become one of the most popular and high-profile characters in the history of the series. Although Worth was 23 at the time of her casting, the character of Gail was supposed to be 16 when she first appeared.

The character's feud with neighbour Eileen Grimshaw (Sue Cleaver) arose when Eileen's son, Todd Grimshaw (Bruno Langley) gave up his university course to remain with Gail's daughter Sarah-Louise Platt (Tina O'Brien); Sarah later married Eileen's older son, Jason, but the marriage soon broke up. Various things, including the 2010 tram crash, have caused them to put aside their differences.

Cleaver has commented, "Eileen's relationship with Gail is horrendous [...] I love all the scraps in the street with Gail. Helen Worth (Gail) and I love doing all that – we have such a laugh with the abusive comments we make for each other. The constant battle is fun. It's a love-hate relationship." Worth has suggested that Gail probably thinks she is "a little better than Eileen". Jenny Platt, who played Violet Wilson, has noted that "Gail's found her nemesis in Eileen, but it's so stupid because actually they are so similar. They are both single mums looking out for their kids." In June 2015, they fought in the street after Gail discovered Eileen had kissed her estranged husband Michael.

In 2008, Gail began a relationship with Joe McIntyre portrayed by Reece Dinsdale. The relationship was rocky just like most of Gail's other relationships but the two characters later went on to marry. Conclusion to the storyline and ending of the relationship resulting in Joe's death. In November 2009, The Sun reported Joe would decide to disappear on a boating holiday in the Lake District after experiencing a debt crisis which begins to spiral out of control. In a surprise twist, Joe ends up losing his life for real when a sail pole knocks him unconscious and into freezing cold water before he can carry out his plan in full. The plot somewhat mirrored the real-life case of fraudster John Darwin, who faked his own death while canoeing before turning up alive five years later in December 2007. A source said: "It's a copycat storyline of Darwin's insurance scam. Corrie bosses have decided that Joe will meet a watery end. He decides to fake his own death to avoid his crippling debt problems and leave wife Gail with the proceeds from his life insurance."

Speaking of how Joe compared to Gail's other husband, Helen Worth said: "On paper, Joe looks quite normal! He's like any other normal man with problems and they're getting on top of him. Gail will share those problems. Like she says, when Gail marries him, Joe's problems become her problems and that's the way it should be. That sums their relationship up, really. She'll do anything for him because Gail can't let her dream go. To realise that he's the wrong man would spell the end of her dream, so she's not going to do it."

In 2009, Worth revealed in an interview with the Daily Mirror that she thought Coronation Street bosses were going to write the character out of the soap as an upcoming storyline would see her on trial for murder: "At the time I was genuinely anxious as to whether it was the end of the road for me and Coronation Street... I wasn't shocked, because it can happen to an actor at any time. But I was very pleased when I found out that whatever happens at Gail's trial, I will be staying in the show."