Dennis van der Geest (Dutch pronunciation: [ˈdɛnɪs fɑn dər ˈɣeːst]; born 27 June 1975) is a Dutch judoka, who won the bronze medal in the men's heavyweight (+100 kg) division at the 2004 Summer Olympics.

In 2005, he became the world judo champion in the men's open division by defeating Russian Tamerlan Tmenov with ippon in the final.

At the 2008 Summer Olympics, Van der Geest was eliminated in the first round by Tamerlan Tmenov.

However, on 7 May 2009 Dennis van der Geest announced his retirement from top sport, owing to his lack of motivation.

In 2019 he played a role in the film Brugklas: De tijd van m'n leven.