Hilarious is the fourth concert film and stand-up comedy album by American comedian and director Louis C.K. It was filmed and recorded at the Pabst Theater in Milwaukee.

The film was first screened at the 26th annual Sundance Film Festival on January 26, 2010, had a one-day theater screening in select cities on September 8, 2010, and had its world premiere on the television network Epix on September 18, 2010. It was later shown on Comedy Central, and the album was released on January 11, 2011, via Comedy Central Records. C.K. re-released the DVD, video and audio album for download and streaming on his website in April 2020.

The film received two nominations at the 63rd Primetime Emmy Awards for Outstanding Picture Editing for a Special (Single or Multi-Camera) and Outstanding Writing for a Variety, Music or Comedy Special. The album peaked at number 77 on the Billboard 200 and won a Grammy Award for Best Comedy Album at the 54th Annual Grammy Awards.