"Alone Again (Naturally)" is a song by Irish singer-songwriter Gilbert O'Sullivan. It was released in 1972. In total, the single spent six weeks, non-consecutively, at No. 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 No. 1). "Alone Again (Naturally)" also spent six weeks at number one on the Easy Listening chart. The track reached No. 3 in the UK Singles Chart.