"One" is a song by American singer-songwriter Harry Nilsson from his 1968 album Aerial Ballet.

A better-known cover version, recorded by Three Dog Night, reached number five on the U.S.

In 1969, the song was also recorded by Australian pop singer Johnny Farnham, reaching number four on the Go-Set National Top 40 Chart.

[5] Three Dog Night released One as the second single from their eponymous first album, with Chuck Negron performing the lead vocal.

Billboard Hot 100 and spent three weeks at number two on the Cash Box Top 100.