Mark Blum (May 14, 1950 – March 25, 2020) was an American actor who worked in theater, film, and television. He 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, Blum 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.

Early life
Blum was born in Newark, New Jersey, to Lorraine (née Fink) and Morton Blum, who worked in the insurance industry. His family was Jewish. He grew up in Maplewood, New Jersey, and graduated from Columbia High School in 1968 and was inducted into the school's hall of fame in 2012. He then went on to graduate from the University of Pennsylvania.