Marie Claire Ross (born 1975 or 1976) is a Canadian B3 classified para-swimmer who has a visual impairment and competed in the Paralympic Games and the IPC World Swimming Championships.

[1] Until she was eight, she had normal eyesight until a genetic disorder reduced it to less than ten percent peripheral vision in the space of two months and thus became legally blind.

[5] Ross finished third for the bronze medal in the women's 100 metres freestyle in the 1994 Canadian Youth Swimming Championships in Winnipeg.

[16] Following these results, she was nominated to be part of Canada's swimming team at the 1996 Summer Paralympics in Atlanta, United States.

[17] Ross established a new world disabled record to claim the gold medal in the women's 200 metres individual medley B3 event.

[18] She went on to claim a second gold medal with another new world disabled record in the women's 100 metres breaststroke B3 competition.