"Leave Me Alone (I'm Lonely)" is a song by Pink, and was the sixth single from her fourth album, I'm Not Dead (2006). It was released in 2007 as a physical CD single in Australia, and as a download-only EP in the UK with "Dear Mr. President". The EP features live versions of both songs. Certain European countries received a physical CD release of the single.

In the beginning of February 2007, before its official release as a single, the song was put on the B-list of BBC Radio 1. It debuted on the UK Singles Chart at number 60, and it rose to number 34, her lowest-peaking UK single at that time. In Australia the single debuted at number 11 and peaked at number five, becoming Pink's fourth top five hit from the album I'm Not Dead; the single also reached the top five in New Zealand and was certified Gold on October 5, 2008, selling over 7,500 copies.

"Leave Me Alone (I'm Lonely)" was written by Pink and co-written and produced by Butch Walker. It is a power pop song, in which she demands some time away from a clinging lover.

The song received mixed to positive reviews from critics. IGN's wrote a mixed to favorable review for the song, stating that "The title should say it all and reveal the ball of confusion that Pink really is. It's one of the most rockin' tunes on the whole album, but it's over-the-top arena pop rock, not ball crunching, barroom rawk." Quentin Huff from PopMatters thought that "Pink summons the spirits of the Go-Gos and Tiffany (“I Think We're Alone Now”)" on the track. Todd Murphs from Stylus Magazine wrote a mixed review, saying that "the ode to schizophrenia, “Leave Me Alone (I’m Lonely),” which may rely too much on the chorus, but at little over three minutes, it’s hardly a bother. Especially when she’s dropping f-bombs left and right.

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