List of Famous people born on January 21st

Otto Lang was a skier and pioneer ski instructor from Yugoslavia, who lived and worked in the United States. After teaching skiing at a variety of smaller resorts in Austria, he joined the Hannes Schneider Ski School in St. Anton am Arlberg, one of the most prestigious ski schools of the era. Like many instructors who taught Schneider's Arlberg Method, Lang was eventually offered a chance to teach in the U.S., at Pecketts' on Sugar Hill in the White Mountains of New Hampshire. He later moved out west and found ski schools on Mount Rainier, Mount Baker and Mount Hood.

Camilla Cederna was an Italian writer and editor. She is said to have introduced investigative journalism to the Italian news media. Some sources give her year of birth as 1921.

René-Louis Baire was a French mathematician most famous for his Baire category theorem, which helped to generalize and prove future theorems. His theory was published originally in his dissertation Sur les fonctions de variable réelles in 1899.

Claudia Augusta was the only daughter of the Roman Emperor Nero by his second wife Roman Empress Poppaea Sabina. She was born in Antium (Anzio) on 21 January 63.

Robert John Hayles is a former track and road racing cyclist, who rode for Great Britain and England on the track and several professional teams on the road. Hayles competed in the team pursuit and madison events, until his retirement in 2011. He now occasionally provides studio-based analysis of cycle races for British Eurosport.