Brian Gyetko, a native of Welland, Ontario, (born January 26, 1968) is a Canadian professional tennis player.

Gyetko played collegiately at Arizona State University from 1987 - 1991, where he achieved NCAA All American status.

Brian Gyetko was a full-time ATP tour player for four years reaching a world ranking of 273 in singles and 152 in doubles.

Gyetko was a quarter-finalist in the ATP 1000 series event in Toronto in doubles, with wins over Bryan Shelton and Patrick Rafter (the '97 and '98 US Open Singles champion).

In 1992 in Glendale, Arizona, Gyetko teamed with Bryan Shelton to make the finals of a 50K challenger, defeating the Jensen brothers (French Open doubles winnerschampions) along the way.