Sage Heather Walker (née Watson born 20 June 1994) is a Canadian athlete specializing in the 400 metres hurdles.

Watson first represented her country at the 2015 World Championships in Beijing, where she reached the semifinals.

In July 2016 she was officially named to Canada's Olympic team, reaching the semifinals in the 400m hurdles and finishing fourth as part of Canada's women's 4x400 metres relay team.

The Canadian team in the 4x400 m relay finished in fourth place for the second consecutive Olympics, which she remarked afterward "really hurts.

"[5] Due to a back injury incurred six weeks before the Tokyo Games, Watson would later announce that she was stepping away from competition to focus on recovery.