Gaétan T. Boucher OC CQ (born May 10, 1958) is a former Canadian speed skating Olympic champion.

Boucher first trained in ice hockey, the leading sport in Canada but then changed to speed skating after winning a national title in 1972.

A four-time Olympic medalist, Boucher was awarded the Lou Marsh Trophy as Canada's outstanding male athlete of 1984.

After Heiden's retirement at age 22, Boucher was among the favourites for the 1981 World Sprint Championship, but after the first day's events he was third.

He then crashed out of the championship with a fall on the 500 m, and despite beating champion Frode Rønning by 1.61 seconds on the final 1000 m, he had no chance to finish anything but last.