Mathew "Mat" Belcher, OAM (born 20 September 1982) is an Australian sailor and a two-time Olympic gold medalist in the 470 dinghy, who currently competes with crew Will Ryan.

Belcher is regarded as the most successful Australian Olympic sailor in history with two gold and one silver medal, adding to his 10 world titles.

He was only six years old when he started sailing in a 10-year-old Sabot (dinghy) tied to the back of his parents' boat.

Coach Victor Kovalenko invited him onto the Australian 470 sailing squad where he became the tuning partner for Nathan Wilmot and Page.

[4] Together with Will Ryan, Belcher was runner up in the 2016 Rio Olympics, winning the silver medal in the 470 class.