Justin Monjo (born 1963) is an American screenwriter, producer and actor, known for Dark City (1998), Jungle (2017) and Farscape (1999).

Monjo graduated from NIDA in 1985, alongside actresses Catherine McClements and Sonia Todd, and director Baz Luhrmann.

Monjo left his acting career behind to work as a writer. He has adapted multiple novels and biographies for stage and screen, including Winton’s Cloudstreet, the recent Channel Seven INXS miniseries and 2019 film remake Storm Boy.