Mark Blum (May 14, 1950 – March 25, 2020) was an American actor who worked in theater, film and television. Blum found success with a lead role in the 1985 film Desperately Seeking Susan, which he followed up the next year with a supporting role in Crocodile Dundee. On the stage, he won an Obie Award for his role in the play Gus and Al during its 1988–1989 season.
Near the end of his career, Blum had a regularly recurring role on the Amazon Prime series Mozart in the Jungle from 2014 to 2018. He also made guest appearances on dozens of shows throughout his career.