Irving Ampofo Adjei (born 6 October 1994), known professionally as Headie One (formerly Headz), is a British rapper and singer. In 2018 he released his second solo mixtape, titled ‘The One’, which included the single "Know Better" featuring rapper RV, it became an "underground hit". Headie One is a member of the UK drill group OFB and is considered to be a pioneer innovator of the UK drill scene.

He is best known for his tracks "18hunna" featuring rapper Dave, "Only You Freestyle" featuring rapper Drake, "Ain't It Different" featuring rappers AJ Tracey and Stormzy and his solo single "Both". The track "18hunna" peaked at number 6 on the UK Singles Chart, while "Only You Freestyle" peaked at number 5 on the UK Singles Chart and "Ain't It Different" peaked at number 2 on the UK Singles Chart.

Headie One has released a series of mixtapes. In 2019, he released his seventh and first mainstream mixtape titled Music x Road, which peaked at number 5 on the UK Albums Chart. In 2020, he released his debut album titled Edna—an album that pays homage to his mother, Edna Duah—which peaked at number 1 on the UK Albums Chart.

Headie One has been involved in numerous altercations and controversies; he has been sentenced to spend time in jail on four separate occasions.