Lois Catherine Marshall, CC (January 29, 1925 – February 19, 1997) was a Canadian soprano.
In 1968, Marshall was invested as a Companion of the Order of Canada but was, over her long career, the recipient of many other honours and awards, such as the University of Alberta National Award in Music (1962), the Centennial Medal (1967), a Canada Music Council Medal (1972), the Ontario Arts Council Medal of Excellence (1973), the Molson Prize (1980), the Toronto Arts Award for music (1987), a Governor General's Performing Arts Award for Lifetime Artistic Achievement (1993) and the Order of Ontario (1993).
She enjoyed a long career, primarily as a concert and recital singer, first as a soprano and later as a mezzo-soprano.
For many years, she toured as the soprano soloist in the Bach Aria Group, and sang in annual Toronto performances of Messiah and St. Matthew Passion under Sir Ernest MacMillan and successive conductors of the Toronto Symphony.
Much of Lois Marshall's recorded legacy is held in the archives of the Canadian Broadcasting Corporation.