Queenie Vassar (born Cecilia McMahon, 28 October 1870 – 11 September 1960) was a Scottish-born actress on stage and in films.

She was performing from childhood, and moved to the United States at age 13 as the protegee of impresario Tony Pastor.

[1] Vassar appeared on the Broadway stage in shows including The Passing Show (1894), Sister Mary (1900),[2] Belle of Bridgeport (1900), The Ladies Paradise (1901), The Toreador (1902), The Slim Princess (1911), The Lady of the Slipper (1912-1913), The Girl from Utah (1914-1915).

[3] Vassar emerged from retirement in 1939[4] to play older women in three films of the 1940s: Primrose Path (1940), Lady in a Jam (1942), None but the Lonely Heart (1944).

Her work as Ginger Rogers's grandmother in Primrose Path is considered by one film scholar "one of the most stunningly naturalistic performances by any character actress on record... a wicked joy to behold.