Martin Platt is a fictional character from the British ITV soap opera Coronation Street, portrayed by Sean Wilson.

His major storylines were a relationship with Gail Tilsley (Helen Worth) following the death of her husband Brian (Christopher Quinten) and the birth of their child David (Jack P. Shepherd); a feud with Gail's former mother-in-law Ivy Tilsley (Lynne Perrie); the adoption of Brian's children Sarah (Tina O'Brien) and Nick (Ben Price); affairs with Cathy Power (Theresa Brindley) and Rebecca Hopkins (Jill Halfpenny); his relationship with 16-year-old Katy Harris (Lucy-Jo Hudson); and his involvement in the rescue of Gail from her killer husband Richard Hillman (Brian Capron).

In February 1989, Brian Tilsley (Christopher Quinten) is murdered and Martin begins comforting his widow and former employer at the café, Gail (Helen Worth).

Martin helps raise Gail's two older children, Sarah-Louise (Lynsay King) and Nicky (Warren Jackson) from her marriage to Brian.

Brian's mother, Ivy (Lynne Perrie), is also hostile towards Martin, especially when he decides that he wants to adopt Nicky and Sarah.

Despite him and Gail planning to go to Canada and adopt the baby, Sarah gives birth to Bethany Platt (Amy and Emily Walton).

When Sarah discovers her boyfriend Todd Grimshaw (Bruno Langley) is gay and had been having an affair with Martin's nurse colleague Karl Foster (Chris Finch), she gives birth prematurely to her son Billy Platt who then dies and she and David are angry with Martin when he continues to date Katy, who knew about Todd's sexuality.

As David returned home, he informed his maternal family about his plans to move to New Zealand, much to their surprise, devastation and disappointment.

Martin then arrives back in Weatherfield for the first time in over twelve years, and met David's new girlfriend Shona Ramsey (Julia Goulding).

Actor Sean Wilson was axed from Coronation Street when a major storyline conference decided the character of Martin had been "played out".

[2] He claimed he was dropped from the show, due to his refusal to portray a storyline in which Martin would be jailed for having a relationship with an underage girl.

[3] In January 2018, it was announced that Wilson would be reprising the role of Martin for a short period as part of David's male rape storyline.

[5] It was later announced on 16 August 2024 that Wilson had quit after beginning filming his return for personal reasons, and that scripts were being rewritten to remove Martin's appearance.

[9] The magazine added, "it was a tough call but the majority of you [readers] don't want to see another soap family torn apart and think he should stay and work things out".