Thomas Ian Griffith (born March 18, 1960) is an American actor, producer, writer and martial artist who has starred in films and on television.

Ian Ross Griffith (25 September 1925 – 8 November 1992) was an Australian politician and a member of the New South Wales Legislative Assembly from 1956 until 1978. He was a member of the Liberal Party and held ministerial positions in the governments of Sir Robert Askin and Eric Willis.

Ian Thomas is a lacrosse player who plays as a attacker, midfielder, and short stick defender. He committed to play for the Chowan University lacrosse team.

Ian Thomas may refer to:

Ian Thomas is an American football player from Baltimore who plays as a tight end for the Carolina Panthers football team.

Ian Thomas Hoelen (born April 30, 1997 in Antwerp) is a Belgian singer-songwriter, musician, actor and model currently based in Antwerp.

Ian James Thomas (born 9 May 1979, Newport, Monmouthshire ) is a Welsh cricketer who played for Glamorgan as a left-handed opening batsman from 1999 to 2005. Thomas, along with Graeme Hick, held the record for highest score in the Twenty20 Cup from 2004 to 2006, after scoring 116 not out to lead Glamorgan to a win with three balls to spare against Somerset Sabres in the group stages of the 2004 tournament.

W. Ian Thomas (13 September 1914 – 1 August 2007) was an evangelist, Christian evangelical writer, theological teacher and founder of the Torchbearers Bible schools.