Spencer Mawhinney (born May 30, 1977) is a Canadian curler from Saint John, New Brunswick.

[1] Mawhinney made the playoffs at the 2009 Alexander Keith's Tankard as lead for Charlie Sullivan.

They took control of the game in the second end by stealing three after Mike Kennedy missed his last shot.

The game was tied 4–4 in the ninth before Team Sullivan gave up a steal of three, ultimately losing the match 7–5.

[3] Mawhinney curled 96% in the game he played against Team Canada's Kevin Koe.