Aba Bayefsky CM RCA (April 7, 1923 – May 5, 2001) was an artist and teacher.

Bayefsky was born to a Jewish family in Toronto, Ontario, the second son of a Russian-born father and a Scottish-born mother.

During his teens, he attended classes at the Children's Art Centre of the Art Gallery of Ontario, where he was encouraged by such artists as Arthur Lismer, Erma Sutcliffe, Dorothy Medhurst, and A. Y. Jackson.

He was appointed an Official Second World War artist in December, 1944, assigned to depict airborne operations over north-west Europe.

He entered the Bergen-Belsen concentration camp shortly after its liberation and recorded what he saw in sketchbooks (these were destroyed in a fire later).