"When I See U" is a song recorded by American recording artist Fantasia Barrino for her second studio album, Fantasia (2006). It written by Louis Biancaniello, Waynne Nugent, Erika Nuri, Kevin Risto, Janet Sewell, Sam Watters, and produced by Midi Mafia along with Mzmeriq. A mid-tempo contemporary R&B ballad, it was released to positive reviews by critics as the album's second single in April 2007. Its digital release spawned several remixes, three of which featured rappers Remy Ma, Young Jeezy, Lumidee, B.G. and Polow da Don.

Upon release, it reached number one on the US Billboard Hot R&B/Hip-Hop Songs chart, and spent a year on the chart, one of only fourteen songs in history to achieve that feat. It was eventually ranked eighth on the chart's decade-end ranking. In December 2007, "When I See U" earned two Grammy Award nominations for Best Female R&B Vocal Performance and Best R&B Song. It lost in both categories to Alicia Keys' "No One" at the 50th Grammy Awards ceremony.