"All I Have" is a song recorded by American entertainer Jennifer Lopez, featuring American rapper LL Cool J. Written by Lopez, Makeba Riddick, Curtis Richardson, and Ron G and produced by Cory Rooney, Ron G, and Dave McPherson, it was released on December 14, 2002 as the second single from Lopez's third studio album, This Is Me... Then (2002).

"All I Have" samples "Very Special" by Debra Laws, who later filed a lawsuit in 2003 against Sony Music Entertainment for "misappropriating her voice" in the song and her name in the credits. The song is a midtempo R&B and hip-hop ballad, about moving on after a breakup. It received favorable reviews from music critics who applauded the chemistry between Lopez and LL Cool J.

The song was a huge success on the charts, reaching number one in the United States (remaining at the top for four weeks) and New Zealand, and entered the top five and the top ten in several countries. After the success of "All I Have" with LL Cool J, the track was included on the re-issue of his album 10. The song was ranked as the 15th most successful song on the Billboard Hot 100 of 2003. Lopez named her 2016 Las Vegas Residency Show, All I Have, after the song.

"J. Lo is definitely one of the most focused people I ever met (...) I could see why she’s so successful. She definitely has all the star qualities. We got along real well — we made a hot record too.... I like it a lot.... Me and her are getting into it, we had beef on the record. It ain’t always peaches and cream. I am trying to reason with her but she ain’t trying to hear it."

On October 19, 2002, American rapper LL Cool J revealed that he had just recorded a song for Lopez's then-upcoming album two days prior, saying: "We did a new song for her album. Well it's actually going to be her next single, I think – it's a lot of fun, a lot of fun." He stated that, "It's got like a mid-tempo beat, pretty melody, you know what I'm saying. I'm rapping, she's singing. We go back and forth with stuff. It's kind of cool, it's fly."

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