Guilty of Romance (恋の罪, Koi no Tsumi) is a 2011 Japanese erotic romantic thriller film directed by Sion Sono. Sono's screenplay is based on a story by Misue Kunizane, which was inspired by the 1997 murder of Yasuko Watanabe. The plot follows two interweaving storylines, the first involving the investigation of a murder in a Tokyo love hotel district, the second about a neglected wife (played by Sono's wife Megumi Kagurazaka) seeking her carnal desires through nude modeling and prostitution.

Two versions of the film exist: the original Japanese cut (144 minutes) and an international edit (113 minutes). The former is currently unavailable outside of Japan, France, Germany, and the United States.