"Boyfriend" is a single by American singer Ashlee Simpson, the first from her second studio album, I Am Me (2005). It has rock-guitar music produced by John Shanks, who collaborated with Simpson on her 2004 debut album, Autobiography, and as with all the songs on I Am Me, it was written by Simpson, Shanks and Kara DioGuardi. "Boyfriend" reached the top 20 on the U.S. Billboard Hot 100.

The lyrics of the song consist of Simpson insisting to another girl that "You really got it wrong: I didn't steal your boyfriend." Simpson has denied rumors that the song refers to an alleged relationship with Wilmer Valderrama, ex-boyfriend of Lindsay Lohan, saying "It's not about one person in particular, it's just something every girl can relate to...It's a song about [how] every girl out there sometimes thinks you stole her boyfriend. It's just making fun of that." She has, however, said that the song was her way of making fun of something she went through, and has said that she leaves the question of who the song is about up to the imagination; in one interview, Ryan Seacrest observed that she grinned every time she denied that it was about "anyone in particular".

The song has been described as "a punky love triangle jam". One review noted its rock guitar positively while saying that the song lacked "distinctiveness".

Originally, "L.O.V.E." had been planned to be released as the first single from I Am Me, but "Boyfriend" soon replaced it ("L.O.V.E." did, however, become the album's second single).

Months after it was promoted in the U.S., "Boyfriend" began to be promoted in the UK; Simpson went to the UK and performed the song on television shows there in January and February 2006. It was the only song from I Am Me released in the UK due to the commitments Simpson had in the U.S.

A popular well known remix was done by Eddie Baez. The remix had rock and dance elements mixed together.

The single's music video, directed by Marc Webb, was filmed in Los Angeles, California over two days, August 31–September 1, 2005. It was the subject of an episode of the MTV show Making the Video that aired on September 12, with the completed video premiering at the end of the episode. Simpson appeared to premiere the video on Total Request Live on September 13, and it debuted on the TRL top ten countdown on September 14 at #9, rising to number #3 the next day, and reaching #1 on September 20. It spent a total of three days at #1, and was on the countdown for 32 days, with its last day being November 7.

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