Mary Frizzell (later Thomasson, January 27, 1913 – October 12, 1972) was a Canadian athlete who competed in the 1932 Summer Olympics.

Frizzell competed for Canada in the 1932 Summer Olympics held in Los Angeles, United States in the 4x100 metres where she won the silver medal with her teammates Mildred Fizzell, Lillian Palmer and Hilda Strike who had won the silver medal on the 100 metres.

In the 100 metre event Frizzell was eliminated in the semi-finals At the 1934 British Empire Games she finished fourth in the long jump competition.

In 2007, Mary Frizzell (Thomasson) was inducted posthumously into the British Columbia Sports Hall of Fame as a Pioneer.

This biographical article relating to Canadian athletics and track and field is a stub.