List of Famous people who are 21

Antonio Mateos is a set decorator. He won an Academy Award in the category Best Art Direction for the film Patton.

Hammond Peek is a New Zealand sound engineer. He has won two Academy Awards for Best Sound and has been nominated for another two in the same category. Of Māori descent, Peek affiliates to Ngāi Tahu and Te Āti Awa.

Gregory W. Moore is an American theoretical physicist who specializes in mathematical physics and string theory. Moore is a professor in the Physics and Astronomy Department of Rutgers University and a member of the University's High Energy Theory group.

Gary Weis is an American film and television director. He was a creator of short films for Saturday Night Live along with Albert Brooks and Tom Schiller. Weis also directed the documentary 80 Blocks from Tiffany's.

Grant Hill is an Australian film producer and unit production manager.

Gary Summers is an American sound re-recording mixer.

Alan Robert Murray was an American sound editor.

Kamal Khalil is an Egyptian engineer and labour activist. He is a leading member of the Revolutionary Socialists, a representative of the Workers Democratic Party and the founder and director of the Center for Socialist Studies in Cairo. He is a critic of the social democrats, youth parties and the Muslim Brotherhood in the post-Mubarak Egypt. He advocates more workers' unity, particularly in regions such as El-Mahalla El-Kubra, which has in the past been a center of industrial struggle by textile workers. Khalil has said Egypt's workers must create independent trade unions and a political party to represent them: "No party will represent the workers other than the workers' party itself." Prior to the Egyptian Revolution of 2011, Khalil had been arrested many times. In 2003, he was arrested by the State Security Investigations Service (SSI) and placed in solitary confinement for his role in the anti-war movement, causing the Stop the War Coalition in Britain to demonstrate outside the Egyptian Embassy in London.

John T. Reitz is an American re-recording mixer. He won an Oscar for Best Sound and was nominated for another four in the same category. He has worked on more than 180 films since 1976.

Ethan Maniquis is an American film editor. Maniquis also served as co-director for the 2010 film Machete.