Marshall Crosby (18 February 1882 – 1 January 1954) born as Joseph Alexander Crosby, was a popular Australian actor and singer of vaudeville, theatre, radio, film and television.
After schooling he initially worked as a clerk at the post office, before becoming a telephonist.
He started his professional show business career after auditioning as a baritone with the theatrical company of Leslie Harrison, and worked in vaudeville with Henry Clay and Harry Rickards, he also performed with the Tivoli Theatre before appearing in a number of musicals for J. C. Williamson Ltd, and also in revues and operetta burlesque.
In the early 1930s he started to take small roles in films and had parts in Dad and Dave Come to Town, Smithy and Eureka Stockade.
He was the father of actor and radio producer Don Crosby, who was an Order of Australia recipient.