"Anna Molly" (pronounced like the word "anomaly" when sung as word play) is the lead single off Incubus's sixth album, Light Grenades. The single was released September 20, 2006, on the Sony Music Store almost a month before its scheduled release. However, it was soon withdrawn for unknown reasons. The single has been extremely well-received by fans of the group.

The song debuted at #19 on the Billboard Modern Rock Tracks chart and reached the #1 spot after 10 weeks on the chart. It stayed at the top for 5 weeks.

The song is abundant with riffs and has a considerable Police influence. It also gains some of its distinct sound through the band's use of a Marxophone, a type of fretless zither. The song's title is a play on the word "anomaly", and a Billboard article says the song describes "a woman who may or may not exist in real life". Also, the lyrics "this city by the sea..." suggest a reference to the Edgar Allan Poe poem "Annabel Lee." There is an acoustic version that is also available through iTunes. The lyrics reference previous Incubus songs like "Wish You Were Here".