"I've Been Lonely for So Long" is a pop-soul song recorded by American southern soul singer Frederick Knight in 1972. It was written by his wife, Posie Knight, and Jerry Weaver. It was released as a single and peaked at number 27 on the Billboard pop chart, number 8 on the R&B chart and number 23 on the British pop chart in 1972.^[1][2] It was also released on his 1973 album of the same name.

The song is noted for its spoken recitation in the middle of the song.

• Mick Jagger, on his 1993 solo album Wandering Spirit
• Paul Young during sessions for his 1983 album No Parlez
• Peter Blakeley recorded the song, under the shortened title "I've Been Lonely", for his 1993 album The Pale Horse, and as a single, which reached #61 on the Australian ARIA chart.
• Black Grape, on their 1997 album Stupid Stupid Stupid
• Lambchop, on their 1998 album What Another Man Spills
• John Farnham, on his 2000 album 33⅓
• Hazmat Modine, on their 2011 album Cicada