List of Famous people born on January 21st

Andrew Ellis is an English badminton player who specializes in doubles. He won the European individual bronze medals with Chris Adcock in 2012 and 2014. Ellis reached top 10 BWF ranking in the men's doubles event with Adcock in November 2013. He competed for England in the men's doubles and mixed team events at the 2014 Commonwealth Games where he won a silver medal in the team event.

Clifford Ray is an American former professional basketball coach and player who is a consultant for the Houston Rockets of the National Basketball Association (NBA). He played three of his ten seasons in the NBA with the Chicago Bulls from 1971 to 1974, and the other seven with the Golden State Warriors from 1974 to 1981.

Krista Nell (1946–1975) was an Austrian film actress.

Anna Maria Agnes "Agnes" van Ardenne-Van der Hoeven is a retired Dutch politician and diplomat of the Christian Democratic Appeal (CDA).

Joseph Achille Le Bel was a French chemist. He is best known for his work in stereochemistry. Le Bel was educated at the École Polytechnique in Paris. In 1874 he announced his theory outlining the relationship between molecular structure and optical activity. This discovery laid the foundation of the science of stereochemistry, which deals with the spatial arrangement of atoms in molecules. This hypothesis was put forward in the same year by the Dutch physical chemist Jacobus Henricus van 't Hoff and is currently known as Le Bel-van't Hoff rule. Le Bel wrote Cosmologie Rationelle in 1929.

Luigi Zoia is a karateka, 6th-Dan karate master, and Italian entrepreneur.

Mario Petri was an Italian operatic bass-baritone particularly associated with Mozart and Rossini roles.