"I'm Sorry" is a 1960 hit song by 15-year-old American singer Brenda Lee. The song was written by Dub Allbritten and Ronnie Self It peaked at No. 1 on the Billboard Hot 100 singles chart in July 1960.
According to the Billboard Book of Number One Hits, Brenda Lee recorded the song early in 1960, but her label, Decca Records, held it from release for several months out of concern that a 15-year-old girl was not mature enough to sing about unrequited love. When the song finally was released, it was considered to be the flip side of the more uptempo "That's All You Gotta Do." Although "That's All You Gotta Do" was a chart success in its own right, reaching No. 6 on the Hot 100, it was "I'm Sorry" that became the smash hit and the standard.