Olajide Olayinka Williams "JJ" Olatunji (born 19 June 1993), known professionally as KSI, is an English Internet personality, professional boxer and musician. He is the CEO of Misfits Boxing and the co-owner of Prime Hydration, XIX Vodka and a restaurant chain known as Sides.
He registered his main YouTube channel in 2009 and has since built a following posting gaming commentary videos of the FIFA video game series. His content later diversified to include vlog and comedy-style videos. As of October 2022, he has over 41 million subscribers and over 10 billion video views across his three YouTube channels.
He featured in the British comedy film Laid in America in 2016 and was the subject of KSI: Can't Lose in 2018, a documentary film following the build-up to his first boxing match, and KSI: In Real Life in 2023, an Amazon Prime Video documentary film following his life from June 2021 to October 2022.

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