Jung Il-hoon (Korean: 정일훈; born October 4, 1994), simply known as Ilhoon, is a South Korean rapper, songwriter, record producer, and actor. He is the main rapper of the South Korean boy band BtoB.

He is well known for his collaborations with artists such as Hyuna and G.NA, as well for being an assistant MC on the variety show Weekly Idol. Ilhoon made his acting debut as he starred in the drama Webtoon Hero: Tundra Show in 2015. He was also known for creating the gestures for “Gwiyomi Player”.