Michael Darren Cassidy (born 3 July 1973) is the Head of youth development of the Wigan Warriors and a former professional rugby league footballer.

Cassidy was a substitute in Wigan's 2–33 defeat by Castleford in the 1993–94 Regal Trophy Final during the 1993–94 season at Elland Road, Leeds on Saturday 22 January 1994, played at second-row in the 40–10 victory over Warrington in the 1994–95 Regal Trophy Final during the 1994–95 season at Alfred McAlpine Stadium, Huddersfield on Saturday 28 January 1995,[6] and played at second-row in the 25–16 victory over St. Helens in the 1995–96 Regal Trophy Final during the 1994–95 season at Alfred McAlpine Stadium, Huddersfield on Saturday 13 January 1996.

[8] He returned from suspension to play for Wigan as a substitute in their 1998 Super League Grand Final victory over Leeds Rhinos.

Cassidy finished his playing career with Cumbrian side Barrow Raiders, helping the club win promotion from National League Two in 2008.

In the 1997 post season, Cassidy was selected to play for Great Britain as a second-row in the first game of the Super League Test series against Australia.