"You're All I Need" is a Mötley Crüe power ballad written by Nikki Sixx and Tommy Lee. It was released as the third and final single from the band's 1987 album Girls, Girls, Girls. A glam metal tune, its guitar solo contains a key change mid-way that is a classic example of diatonic chord progression. The song charted at 83 on the US Charts, and 23 on the UK Charts.

The song was praised by Jon Bon Jovi as "the best ballad Mötley Crüe have ever written". When informed of this Nikki Sixx laughed because of the gruesome meaning behind the song.

The song is about a girlfriend that Nikki Sixx had who he believed cheated on him with Jack Wagner, an actor in General Hospital, who at the time had a single out called "All I Need". Nikki wrote his version and gave it to his girlfriend, but had no intention of recording it. However, the rest of the band praised the song and it was recorded for the Girls, Girls, Girls album. In Nikki's book The Heroin Diaries, a journal entry states that Tommy Lee was playing the song on the piano, and Nikki wrote the lyrics for the piano part.

The video (which was shot in black-&-white) depicts a man killing a woman with a kitchen knife. He then takes a picture of her off the wall with his bloody hand and throws in it the fireplace. After the killing part, he throws an office chair at the wall, and throws a rock at a mirror breaking it. The camera zooms around and focuses on the stove and pots, a sink, empty picture frames on the floor and a picture of Jimi Hendrix. The police then arrive pointing their guns and arrest him. Paramedics put the dead woman in a body bag and the man is hauled away in front in many onlookers. This video was banned from MTV due to the scene where the man kills the woman. An edited version aired on MTV, which removes the killing scene. The video was directed by Wayne Isham.

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