Belle Montrose (born Isabelle Donohue; April 23, 1886 – October 26, 1964) was an American actress and vaudeville performer.

After Carroll Abler died in 1923, young Steve Allen began living with the Montrose family on Chicago's South Side, near Hyde Park, while his mother toured.

After Carroll's death, Belle continued in vaudeville, working as a solo act and with other comedians.

Years later, Steve Allen wrote about her in his memoir, Mark It and Strike It: An Autobiography (1960).

Montrose's movie credits include The Absent-Minded Professor (1961) and its sequel Son of Flubber (1963).