"Obsessed" is a song by American singer and songwriter Mariah Carey from her twelfth studio album, Memoirs of an Imperfect Angel (2009). The song was written and produced by Carey, Tricky Stewart and The-Dream, and was released as the album's lead single on June 16, 2009, by Island Records. The song draws musical influences from contemporary R&B and hip hop, and is built around a thumping bassline. Additionally, the song is accentuated by hand claps, while Carey's voice is processed with Auto-Tune. Lyrically, the song describes Carey's dilemma regarding constant claims of a prior relationship from rapper Eminem, although he is not specifically mentioned.

Memoirs of an Imperfect Angel is the twelfth studio album by American singer-songwriter Mariah Carey. It was released on September 29, 2009, by Island Records. After promotion for her previous album, E=MC² (2008) ended, Carey began to work on a new album, producing songs with Terius "The-Dream" Nash and Christopher "Tricky" Stewart, and revealed the album's title through Twitter. Carey said that Memoirs of an Imperfect Angel would have "big ballads", and that "each song is its own snapshot of a moment in a story".