What Love Is is a 2007 romantic comedy film, written and directed by Mars Callahan, starring Cuba Gooding Jr., Matthew Lillard, Sean Astin, Anne Heche, and Gina Gershon. Cuba Gooding Jr. plays a man who finds out the true nature of love one Valentine's Day when he wants to propose to his girlfriend.

As of April 2007, the film has been harshly reviled by critics, receiving only 17% at Rotten Tomatoes, and a 14 on Metacritic.

The advertising campaign for the film sparked some minor online controversy when Big Sky Motion Pictures sent fake internet posts on IMDB.com praising the film. Also, while audtioning for Mars Callahan's latest film, Spring Break '83, the production company required many people auditioning for roles to pay to see a "preview" of the film, despite being released nearly a month ago. Mars Callahan has frequently been accused by his investors of stealing money from the production and using it for his own benefit.