"Son of a Gun (I Betcha Think This Song Is About You)" is a song by American singer-songwriter Janet Jackson with Carly Simon from Jackson's seventh studio album, All for You (2001). It was written and produced by Jackson, Jimmy Jam and Terry Lewis, with additional lyrics by Simon. The R&B and hip hop song is built around a sample of 1972's "You're So Vain" by Simon, who also added some new spoken parts into the song; it talks about an unidentified man who attempted to extort money from Jackson. An official remix featuring Missy Elliott was released as the third single from the album on December 11, 2001 by Virgin Records.

The album version of "Son of a Gun (I Betcha Think This Song Is About You)" received mixed reviews from music critics, with some calling it a highlight from the album, while others criticized Simon's rapping. The remix version also received a mixed reaction from reviewers. The song reached number 28 on the US Billboard Hot 100, becoming Jackson's lowest-charting single since 1983, and also reached low positions worldwide. Its accompanying music video directed by Francis Lawrence depicts Jackson stalking a man in a hotel. "Son of a Gun (I Betcha Think This Song Is About You)" was performed on the 2001–02 All for You Tour.

According to Jackson, she phoned American singer-songwriter Carly Simon, asking for permission to use samples of her song "You're So Vain", but Simon wanted to re-record her vocals. She agreed, with Simon wanting to write new lines. Jackson's producer Jimmy Jam sent her the tracks they were already working on, and she went into a studio on Martha's Vineyard to record some material. She rapped, initially thinking that Jackson and the producers would not use it, but they decided to marry both tracks, as the singers thought it "worked perfectly", and it became a duet. Simon expressed that Jackson "could not have been sweeter or more appreciative".

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