Gwendolyn Koldofsky (née Williams; November 1, 1906 – November 12, 1998) was a Canadian piano accompanist and music educator. She was born Gwendolyn Williams in Bowmanville, Ontario and studied piano with in Toronto, with Tobias Matthay in London and with Marguerite Hasselmans in Paris. She also studied accompanying in London with Harold Craxton. In 1943, she married Adolph Koldofsky, a violinist. Koldofsky lived in Toronto until 1944, first moving to Vancouver and then to Los Angeles in 1945. She created the first Department of Accompanying at the music school at the University of Southern California in 1947, teaching accompanying chamber music and song literature. She also gave master vocal classes for singers and taught accompanying at other North American music schools and universitie