"Be Without You" is a song by American recording artist Mary J. Blige. It was written by Johnta Austin, Bryan Michael Cox, Jason Perry and Blige for her seventh studio album, The Breakthrough. Produced by Cox and Ron Fair, it was released as the album's first official single in late 2005.

Ranking among the most played songs on US radio in the year 2006, the single was certified double-platinum by the RIAA in 2007. With 15 weeks at number one and a 75-week span on the Hot R&B/Hip-Hop Songs chart, it is the most successful R&B song in the 50-year history of that chart. It is also one of Mary J. Blige's most successful singles to date, peaking at number three on the Billboard Hot 100. The song was nominated for Record of the Year and Song of the Year and won the Best R&B Song and Best Female R&B Vocal Performance categories at the 49th Annual Grammy Awards.

"Be Without You" is an R&B and hip hop soul song written in the key of D minor with a tempo of 73 beats per minute. The song follows a chord progression of Dm – B♭maj7 – C – Dm – Gm7 – C – A7, and Blige's vocals span from F₃ to D₅.

The music video for "Be Without You" was directed by Matthew Rolston and was shot on various locations in New York City in October 2005.

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