"I'll Be Lovin' U Long Time" is a song by American singer and songwriter Mariah Carey, taken from her eleventh studio album, E=MC² (2008). It was written by Carey, Aldrin Davis, Crystal Johnson and Clifford Harris, and produced by the former two. As the song's hook and instrumentation is derived from sampling DeBarge's "Stay with Me", Mark DeBarge and Etterlene Jordan also share songwriting credits. "I'll Be Lovin' U Long Time" was released as the album's third single in the United States, Australasia and select European countries on July 1, 2008. Drawing influence from pop, soul and R&B music genres, and featuring a piano and keyboard-driven melody, the song's lyrics demonstrate the lengths the protagonist will go for her lover, and how she will be 'lovin' him long time'.

The song received generally positive reviews from music critics, with many considering it a highlight from the album. Many reviewers complimented its production and clever interpolation of the DeBarge sample, while some criticized it for being too simple for an artist of Carey's caliber. Though expected by critics to have surely become Carey's 19th chart-topping single in the United States, the track only managed to reach a peak position of number fifty-eight on the Billboard Hot 100. Throughout other countries where it was released, the song achieved relatively weak charting, peaking within the top forty in Japan and Slovakia, and peaking at numbers sixty-nine and eighty-four in Canada and the United Kingdom, respectively.

Carey performed "I'll Be Lovin' U Long Time" on few live televised appearances, in comparison to the strong promotional boost the album's lead single, "Touch My Body" received. She first performed the song live at the MTV Video Music Awards Japan, on June 2, 2008. On July 31, 2008, she performed the song as part of a five-piece outdoor concert filmed for Jimmy Kimmel Live!, as well as at the 2008 Teen Choice Awards to a standing ovation on August 8, 2008. Additionally, it was featured on the final scene of You Don't Mess with the Zohan (2008), a film in which Carey made a cameo appearance. The song's accompanying music video was shot over a three-day interval in Hawaii, and makes usage of the islands scenery, as well as shots of Carey in several bikinis, while swimming with a dolphin.

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