Ondřej Trojan (born 31 December 1959 in Prague) is a Czech film and theater actor, director and producer. He comes from an artistic family, father Ladislav Trojan and younger brother Ivan are Czech actors. After graduating from the FAMU in Prague in 1991, he made his debut with the film Let's Sing a Song by screenwriters Jan Hřebejko and Petr Jarchovský. The second feature film was the very successful film Želary based on the short story by Jozova Hanula by Květa Legátová, which was nominated eleven times for the Czech Lion Award as well as the American Academy of Motion Picture Arts and Sciences Oscar. In 2010, Trojan directed and produced his third film, an Identity Card. In 2018, he released his fourth film, Toman, in cinemas.

He focuses on theater directing and acting in the legendary Prague Theater Sklep. Together with Tomáš Hanák and Jiří Fero Burda, they founded their own production and trading company Total HelpArt T.H.A.