List of Famous people who died at 21

Dmitry Alexandrovich Borovikov also known as «Kislyi» (Sour) — was a Russian neo-Nazi and neo-Pagan, the organizer of two extremist groups "Mad Crowd" and "Combat Terrorist Organization". He died from a wound when detained by operatives of the 18th (political) department of the UBOP on May 18, 2006.

Leonard Kevin Bias was an American college basketball player who attended the University of Maryland. During his four years playing for Maryland, he was named a first-team All-American. Two days after being selected by the Boston Celtics with the second overall pick in the 1986 NBA draft, Bias died from cardiac arrhythmia induced by a cocaine overdose.

Sergei Chalibashvili was a Georgian competitive diver from the Soviet Union. He earned a silver medal at the European Youth Championship in 1978 in Florence, diving from the 10-meter diving platform.

Teruichi Aono is a 9-dan professional shogi player from Yaizu, Shizuoka.

Satoshi Takano is a Japanese professional shogi player ranked 5-dan.