Greenbaum is a surname. Notable people with the surname include:
Andrew Britt GreenbaumDaniel "Dan" Robert Greenbaum (born 1969), an American volleyball playerGus Greenbaum, American gangsterHarrison Greenbaum (born 1986), an American stand-up comedian and comedy writerJoanne Greenbaum, New York ArtistMutz Greenbaum German cinematographerNorman Greenbaum, American singer-songwriterSidney Greenbaum (1929 - 1996), a British scholar of the English language and linguisticsYitzhak Greenbaum