"He Loves U Not" is a song by American girl group Dream. It was released on August 22, 2000, as the group's debut single and is featured on their debut album, It Was All a Dream (2001). The song was written in 1999 by Steve Kipner, David Frank and Pamela Sheyne, with the former two doing the production. An dance-pop and R&B song, "He Loves U Not" is about a girl confronting another girl trying to steal her boyfriend. An early version of the song started with a young girl's voice saying "He loves me, he loves you not," but was removed from both album and single versions, with the phrase "He loves you not" being heard at the end of the album version.

"He Loves U Not" received mixed reviews from critics who gave credit to the production and lyrics but felt that it was derivative compared to other songs of its time. The song peaked at number two on the Billboard Hot 100 chart for two weeks. It also peaked at numbers three, nine, and 15 on the Mainstream Top 40, Rhythmic, and Hot R&B/Hip-Hop Songs charts, respectively. Worldwide, it reach the top 40 in several countries, including Canada, New Zealand, Norway, and the United Kingdom. The song was certified Gold by the Recording Industry Association of America (RIAA) for selling over 500,000 copies in the United States.

An accompanying music video for the song, directed by Marcus Raboy, premiered on MTV's Total Request Live and features the girls dancing in three different settings: a white room with the Dream logo behind them, a California desert and a rotating white room. They first performed the song live by touring with fellow pop group *NSYNC on their No Strings Attached Tour. They made their television debut performing the song live on TRL and would make later appearances at Live with Regis, The Tonight Show with Jay Leno, The Rosie O'Donnell Show, the 2001 Walt Disney World Summer Jam Concert, The Early Show and the 7th Annual Soul Train Lady of Soul Awards.