"Outta My Head (Ay Ya Ya)" is a song recorded by American singer Ashlee Simpson for her third studio album, Bittersweet World (2008). The song premiered on AOL Music on November 30, 2007 and was released for digital download on December 11.

The song was first mentioned in a September 2007 MTV News article describing a sneak peek of Simpson's album; the article gave its title as "Ay Ay Ay". Simpson's father Joe Simpson joked that the song was about her mother Tina, while Tina replied that the song was also about Joe; Simpson herself said that it was "not about my mom. I just have too many voices in my head, everyone having their own opinion."

On November 13, 2007, Simpson told MTV News at CosmoGIRL!'s Born to Lead Awards that the album was completed and that it would be released in March 2008, with its first single, "Outta My Head (Ay Ya Ya)", to be released in January. She described "Outta My Head (Ay Ya Ya)" as a "fun, dancey song" with "a little bit of an '80s feel" and said that it was about all of the people in her life. She said that the video would be filmed in December. In December, speaking about the song, she referred to the need to "have your own creativity and place" away from others and how those other voices and opinions can lead to a feeling of frustration: "At the end of the day you're like 'Ahhh! Everybody stop!'".

Reviews of the single were mostly positive. In their review of the song, Billboard noted that it was a "fun little romp, but ['Outta My Head'] may have difficulty returning Simpson to top 40 favor".Entertainment Weekly's Simon Vozick-Levinson noted that although the song's "beat [was] catchy enough...her vocals are sorta grating". In its Bittersweet World review, Rolling Stone said that the song "channels Missing Persons", while the Houston Chronicle said in its album review that "Outta My Head" "has the same synth claps and skulking groove of Madonna's "Burning Up" and a booming, Devo-esque chorus." The New York Daily News, reviewing the album, said that "you won't be able to get a song like 'Outta My Head' outta yours".The Washington Post was more critical, describing the song as "an attempt at '80s synth-pop that winds up cribbing its melody from Men at Work".

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