Hysterical Psycho is a 2009 American horror comedy film written and directed by Dan Fogler. It stars Randy Baruh, Noah Bean, Kelly Hutchinson, Charissa Chamorro, Nicholas DeCegli, and Kate Gersten as a group of friends who encounter "lunar radiation" that causes people to go insane.

A theater troupe from New York City visit a secluded area known as Moon Lake. Unknown to them, the cabin in which they stay is located on a Native American burial ground among other sites. In addition, it is the location of a lunar meteorite that has bathed the area in radiation that causes people to go violently insane.

Gilbert Gottfried and writer-director Dan Fogler appear in cameos.

Hysterical Psycho premiered at the Tribeca Film Festival. Indican released it on DVD in the US on February 18, 2014.^[1]

John Anderson of Variety wrote that it was probably more fun to make than it is to watch, as horror films have already parodied themselves at length.^[2] Bloody Disgusting rated it 4.5/5 stars and wrote, "Hysterical Psycho is by far one of the most absurd films I’ve ever admitted to loving."^[3] Mark L. Miller of Ain't It Cool News compared it to Student Bodies and wrote, "There are moments that will definitely make you laugh, but in between those guffaws, I found myself mostly impressed by the intensity and creativity of the scares."^[4] Matt Donato of We Got This Covered rated it 2.5/5 stars and wrote, "It's a shame that Hysterical Psycho never really comes together, because there are some hilariously horrifying moments of spoofy slasher goodness to be found here."^[5]