"I Believe in Love" is the debut solo single by American musician Kenny Loggins.

It was written by Loggins with lyrics by Alan and Marilyn Bergman.

The song was introduced by Barbra Streisand in the 1976 film A Star Is Born, and appears on its soundtrack album.

It was released in November 1976 as the B-side to the album's first single, "Evergreen (Love Theme from A Star Is Born)".

Billboard Hot 100 and number 37 on the Easy Listening chart.