Marcinkiewicz is a Polish family name of patronymic origin, meaning "son of Marcin (Martin)". People named Marcinkiewicz include:
- Iwona Marcinkiewicz (born 1975), Polish archer
- Józef Marcinkiewicz (1910–1940), Polish mathematician, author of the Marcinkiewicz theorem
- Kazimierz Marcinkiewicz (born 1959), former prime minister of Poland
- Wincenty Dunin-Marcinkiewicz, or Vintsent Dunin-Martsinkyevich (1808–1884), Belarusian–Polish writer and social activist
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