"Alone Again (Naturally)" is a song by Irish singer-songwriter Gilbert O'Sullivan. It was released in 1972 at the same time as (but not on) the album, Back to Front. In total, the single spent six weeks, non-consecutively, at #1 on the United States Billboard Hot 100 singles chart. Billboard ranked it as the No. 2 song for 1972. In Casey Kasem's American Top 40 of the 1970s, "Alone Again (Naturally)" ranked as the fifth most-popular song of the decade (Debby Boone's "You Light Up My Life" was #1). "Alone Again (Naturally)" also spent six weeks at number one on the Easy Listening chart. The track reached #3 in the UK Singles Chart.