Martin  Bayfield is an English actor, broadcaster, and former rugby union player who played lock forward for Northampton Saints, Bedford Blues and England, gaining 31 England and 3 Lionscaps.  He served with the Metropolitan Police from 1985 to 1989, before transferring to Bedfordshire Police. The 208 cm (6 ft 10in) tall Bayfield made his England debut in 1991, and although he was omitted from the 1991 World Cup squad, he was a part of the 1992 Five Nations Grand Slam winning side. He went on the 1993 British Lions tour to New Zealand, and was part of the 1995 World Cup squad. He would play 18 times partnering Martin Johnson. His final appearance for England came in the 1996 Five Nations match against Wales.

Since rugby retirement, Bayfield has worked as a journalist, an after-dinner speaker, and has appeared in all of the Harry Potter films playing the half-giant Hagrid, as Robbie Coltrane's body and stunt double (he also appeared in Harry Potter and the Chamber of Secrets as a young Rubeus Hagrid). Continuing the acting theme, he also played a cyclops in Jonathan Liebesman's Wrath of the Titans, the sequel to the 2010 movie Clash of the Titans. Bayfield also played "Rugby Player 1" in an episode of the BBC One series New Tricks (first shown on 1 September 2008).

In his broadcasting career, Bayfield has presented the NFL and World's Strongest Man coverage on UK Channel Five and worked as a rugby correspondent on BBC Radio 5 Live. He also served as a presenter for ITV's coverage of the 2007 and 2011 Rugby World Cups, as well as presenting ITV's Guinness Premiership highlights. From 2012 to 2016, he co-presented BBC's Crimewatch with Kirsty Young. From 23 August 2018 Martin took part in Celebrity Masterchef of which he reached the final three shown on BBC one on 28 September 2018.