"Ah! Leah!" is a song by Mark Avsec and American rock musician Donnie Iris from his 1980 album Back on the Streets. The song was released as a single in late 1980 and reached number 29 on the US Billboard Hot 100, 22 on the Cash Box Top 100, and 19 on the US Billboard Top Tracks chart. The song is widely considered to be Iris' signature song and was most popular in Canada, where it became a Top 10 hit.
A full complement of eight musicians appeared in the early live performances of the song, including lead singer Iris, a drummer, three guitar players, one keyboardist and at least two backing vocalists, one female and one male.