"That's When I Love You" is a song co-written and recorded by American country music artist Phil Vassar.

It was released in October 2001 as the fifth and final single from his debut album Phil Vassar.

Vassar co-wrote this song along with his former wife Julie Wood.

The song features a backing vocal from Jo Dee Messina.

Billboard Hot Country Singles & Tracks for the week of November 3, 2001.