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 Matvey Martinkevich (born 2002), Russian and Serbian footballer Maxim Martsinkevich (1984–2020), Russian neo-Nazi activist Mike Marcinkiewicz (born 1966), Canadian professional ice hockey player Vintsent Dunin-Martsinkyevich, or Wincenty Dunin-Marcinkiewicz (1808–1884), Belarusian–Polish writer and social activist