Olajide Olayinka Williams "JJ" Olatunji (born 19 June 1993), known professionally as KSI, is an English YouTuber, rapper and boxer. He is a co-founder and member of the British YouTube group known as the Sidemen. He is the CEO of Misfits Boxing and the co-owner of Prime Hydration energy drink, XIX Vodka, and a restaurant chain known as Sides.
KSI registered his main YouTube account in 2009 and built a following posting gaming commentary videos of the FIFA video game series. His YouTube content has 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.
KSI's 2020 debut studio album, Dissimulation, debuted at number 2 on the UK Albums Chart. His second studio album, All Over the Place, debuted at number 1. He has achieved fourteen top 40 singles on the UK Singles Chart, seven of them ending up in the Top 10 and five of them ending up in the Top 5. KSI featured in the British comedy film Laid in America (2016), and was the subject of KSI: Can't Lose (2018) and KSI: In Real Life (2023), a documentary film following the build-up to his first amateur boxing fight against British YouTuber Joe Weller and an Amazon Prime Video documentary film following his life from June 2021 to October 2022.

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