Janet Blair was an American big-band singer who later became a popular film and television actress.

My Sister Eileen is a 1942 American comedy film directed by Alexander Hall and starring Rosalind Russell, Brian Aherne and Janet Blair. The screenplay by Joseph A. Fields and Jerome Chodorov is based on their 1940 play of the same title, which was inspired by a series of autobiographical short stories by Ruth McKenney originally published in The New Yorker. The supporting cast features George Tobias, Allyn Joslyn, Grant Mitchell, Gordon Jones and, in a cameo appearance at the end, The Three Stooges.