KSI
KSI is a British influencer, musician, and former professional boxer best known for his YouTube career, Sidemen membership, and crossover boxing matches.
KSI is the stage name of British influencer, musician, and former professional boxer Olajide Olayinka Williams Olatunji, born 19 June 1993 in London, England.
What it is
KSI is a major English-language internet personality known for his YouTube career, membership in the Sidemen, and crossover boxing matches. He has also built a music career and co-founded business ventures including Prime Hydration, Lunchly, and Misfits Boxing.
Why it matters
KSI's influence extends globally, including to Canadian audiences, through his YouTube content, music releases, and high-profile boxing events. His brand partnerships and media presence make him a notable figure in digital entertainment and sports crossover culture.
Key details
He is 33 years old as of 2026 and has served as a judge on Britain's Got Talent since 2025. KSI has competed as a cruiserweight boxer and announced in June 2026 that he was leaving the Sidemen. His real name is Olajide Olayinka Williams Olatunji, and he goes by the nickname JJ.
In short
- KSI is a British influencer, musician, and former professional boxer.
- He co-founded Prime Hydration, Lunchly, and Misfits Boxing.
- He has been a judge on Britain's Got Talent since 2025.
- He announced his departure from the Sidemen in June 2026.
KSI is relevant to Canadian readers as a major English-language internet celebrity with global reach in YouTube, music, boxing, and brand partnerships, all of which have audiences in Canada.
Quick questions
Who is KSI?
How old is KSI?
What is KSI's real name?
Sources
- Wikipedia — https://en.wikipedia.org/wiki/KSISupports: Birth name, birth date, nationality, occupations, Sidemen, Misfits Boxing, business ventures, and Britain's Got Talent role.
- USA Today — https://www.usatoday.com/story/sports/boxing/2023/10/10/ksi-everything-to-know-about-youtuber-boxer-entrepreneur/71131099007/Supports: Public identity, YouTube fame, boxer-musician-entrepreneur profile, and background.
- Simple English Wikipedia — https://simple.wikipedia.org/wiki/KSISupports: Birth name, birth date, career summary, and boxing activity.
- Rayo — https://www.hellorayo.co.uk/mfr/entertainment/music/ksiSupports: Age, Sidemen departure claim in June 2026, and general career overview.
- Famous Birthdays — https://www.famousbirthdays.com/people/olajide-olatunji.htmlSupports: Birth date and age.
- Fandom — https://sidemen.fandom.com/wiki/KSISupports: Sidemen association and professional name history.