My Sassy Girl (Korean: 엽기적인 그녀; literally, That Bizarre Girl) is a 2001 South Korean romantic comedy film directed by Kwak Jae-yong. It tells the story of a man's chance meeting with a drunk girl on the train which changes his life. It is ostensibly based on a true story posted on the internet in a series of blog posts written by Kim Ho-sik, which were later adapted into a novel.

The film was extremely successful in South Korea and was the highest grossing Korean comedy of all time. When My Sassy Girl was released throughout East Asia, it became a mega blockbuster hit in the entire region, from Japan, China, Taiwan, Hong Kong, as well as Southeast Asia, to the point where it was drawing comparisons to Titanic.

An American remake, starring Jesse Bradford and Elisha Cuthbert, and directed by Yann Samuell was released in 2008. A Japanese drama adaptation with Tsuyoshi Kusanagi and actress Rena Tanaka as the leads started broadcasting in April 2008.