"Clair" is a song by Gilbert O'Sullivan, released in 1972 as the first single from his second album Back to Front.

The real Clair who inspired the song was the three-year-old daughter of O'Sullivan's producer-manager, Gordon Mills,[1] and his wife, the model Jo Waring.

The harmonica solo in the song, played by Mills, modulates up a semitone, from A to B-Flat, before going back to A.

In late December, it peaked at number two on the Billboard Hot 100 in the US, behind both "Me and Mrs. Jones" by Billy Paul and "You're So Vain" by Carly Simon.

[4] "Clair" was also O'Sullivan's second and last number one hit on the U.S. Easy Listening chart, after "Alone Again (Naturally)".