List of Famous people who are 21

Brenock Grant O'Connor is an English actor and singer. He is best known for his portrayal of Olly in the HBO fantasy TV series Game of Thrones (2014–2016). He was part of the main casts of the British series Dickensian (2015–2016), Living the Dream (2016–2019), and, most recently, the Amazon Prime series Alex Rider (2020–).

Michael (Mike) Suby is an American television and film score composer and music producer. He graduated from the Berklee College of Music in Boston, Massachusetts in 2000.

Guillaume Rocheron is a French visual effects supervisor who was born in 1981 in Paris. He began his career in 2000 at the Paris-based BUF Compagnie, and after five years there he got invited to work for the Moving Picture Company. He won the Academy Award during the 85th Academy Awards for the film Life of Pi in the category of Best Visual Effects. He shared his win with Donald R. Elliott, Erik-Jan de Boer and Bill Westenhofer. In 2020, he received his second Academy Award nomination for Best Visual Effects, and second win, for the 2019 film, 1917, at the 92nd Academy Awards.

Michael Lennox or Michael Carson Lennox is a Northern Irish film director, who was born and raised in County Antrim, Northern Ireland.