Omari Ishmael Grandberry (born November 12, 1984), better known by his stage name Omarion , is an American R&B singer, songwriter, actor, and dancer. He rose to prominence as the lead singer of the boy band B2K. The group achieved success in the early 2000s with their singles "Gots ta Be", "Uh Huh", "Girlfriend", and the number-one hit "Bump, Bump, Bump" (featuring P. Diddy).

After the group disbanded in 2004, Omarion embarked on a solo career, with the release of his debut solo album, O (2005), which debuted at the top of the Billboard 200 chart. O received a Grammy Award nomination for Best Contemporary R&B Album at the 48th Annual Grammy Awards. The same year, he was featured on the single "Let Me Hold You" by Bow Wow, which peaked at number 4 on the Billboard Hot 100.

His second solo album, 21 (2006), became his second consecutive chart- topping album, and spawned the hit single "Ice Box", becoming his highest charting single reaching number 12 on the Hot 100. He released his third studio album, Ollusion in 2010. After signing to Rick Ross' Maybach Music Group, he released his fourth solo album, Sex Playlist in 2014, spawning the single "Post to Be" (featuring Chris Brown and Jhené Aiko), which reached the top 20 on the Billboard Hot 100 and was certified 3× platinum by the Recording Industry Association of America (RIAA).

Omarion has also ventured into acting, with appearances in films such as You Got Served , Fat Albert , Somebody Help Me and The Proud Family Movie. As a solo artist, he has received a BET Award, a Billboard Music Award, and a Soul Train Music Award.