Michael James Williamson (born 8 November 1983) is an English professional football manager and player who plays as a centre back. He is the player-manager of National League North club Gateshead.
Born in Stoke-on-Trent, Staffordshire, Williamson played six first-team games for Torquay United before joining Southampton in November 2001 for an initial fee believed to be in the region of £100,000. However, Williamson was unable to get into the first team at Southampton. He returned to Plainmoor on loan for two months in September 2003, where he made 11 further appearances. A further loan spell at Doncaster Rovers—then Third Division leaders—followed on transfer deadline day in March 2004, although he did not feature for the South Yorkshire club.
Wycombe Wanderers manager Tony Adams secured Williamson's services on a season-long loan in July 2004, a move that was made permanent at the end of the 2004–05 season. Williamson made the number 6 shirt his own from the start of the 2005–06 season. In total, he made 144 league appearances for Wycombe, scoring 11 league goals during his time at the club.