New Yorker through and through, Michael Rapaport was born on March 20, 1970, in Manhattan, to June Brody, a radio personality, and David Rapaport, a radio program manager. He is of Polish Jewish and Russian Jewish descent.

Rapaport moved to Los Angeles to try stand-up comedy following high school graduation (which came after a series of expulsions), but he never lost, forgot or deserted his New York roots.