Marshak, Marschak or Marshek () 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
* Sondra Marshak (born 1942), American fiction writer
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