Marko Klok (, born 14 March 1968) is a volleyball player from the Netherlands who represented his native country at two Summer Olympics, starting in 1992 in Barcelona. There he won the silver medal as a part of the Dutch national men's team, and later took ninth at the 2004 Summer Olympics in Athens. He played a total of 378 international matches for the Dutch volleyball team.
Klok and partner Michiel van der Kuip won the 1995 European Beach Volleyball Championships.
In November 2021 he became the national coach of the women's teams of Beach Volleyball Team Netherlands (BTN).
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