"P.S. I Love You" is a popular song published in 1934, with music by Gordon Jenkins and lyrics by Johnny Mercer. The original hit recording was made by Rudy Vallée and His Connecticut Yankees on 9 September 1934 and released by RCA Victor as a single (Victor 24723), coupled with "Strange". The key given for the song is E-flat.
Later versions include recordings by The Hilltoppers in 1953, Billie Holiday in 1954 and Frank Sinatra in 1957, as well as a version by The Vogues in the 1960s. Tom T. Hall recorded it in 1984, a release that gave him his final Top 10 country hit. Bette Midler sang it in the 1991 film For the Boys, and Nellie McKay recorded it for the soundtrack of a 2007 film. The song has been recorded by singers across several decades, from the 1950s to the 2000s.