Marshak, Marschak or Marshek (Russian: Маршак) is a surname of Jewish (eastern Ashkenazic) origin. It's a contraction of Our teacher rebe Shmuel Kaidanover.

• Archie Marshek (1902–1992), American film editor
• Boris Marshak (1933–2006), Russian archaeologist
• Chris Miles (born as Christopher Miles Marshak 1999), American rapper
• Jacob Marschak (1898–1977), American economist
• Robert Marshak (1916–1992), American physicist
• Samuil Marshak (1887–1964), Russian writer, translator and children's poet