Matthew de Boer (born 10 March 1990) is a former Australian rules footballer who played for the Fremantle Football Club and the Greater Western Sydney Giants in the Australian Football League (AFL).

[1] After representing Western Australia at the 2008 AFL Under 18 Championships and being named in the under 18 All-Australian team,[2] de Boer was drafted to Fremantle in the 2009 rookie draft with Fremantle's second selection, number 19 overall.

[3] After displaying good form during the 2009 pre-season, he was elevated to Fremantle's senior list as a nominated rookie, along with Greg Broughton.

[4] De Boer made his AFL debut for Fremantle in round 6 of the 2009 AFL season at Subiaco Oval in the Western Derby against the West Coast Eagles, as a replacement for the injured Rhys Palmer.

While at Greater Western Sydney, De Boer earned prominence for his shut-down role on 2017 Brownlow Medallist Dustin Martin, restricting him to only 15 disposals in his side's 49-point win over Richmond in round three of the 2019 AFL season.