List of Famous people born on January 21st

Oscar II was King of Sweden from 1872 until his death in 1907 and King of Norway from 1872 to 1905.

Mahmut Demir, is a former Turkish Olympic medalist, World and European champion sports wrestler in the Super heavyweight class (>100 kg). He won the gold medal at the 1996 Olympics in Men's Freestyle wrestling.

Abaza Mehmed Pasha was a statesman and military commander of the Ottoman Empire, the namesake of the Abaza rebellion. He was the beylerbey of the Bosnia Eyalet in 1628–1631. He was executed by sultan Murat IV in 1634.

Tomohito Yoneno is a Japanese professional baseball catcher for the Hokkaido Nippon-Ham Fighters in Japan's Nippon Professional Baseball.

Alejandro 'Álex' Pérez Aracil is a Spanish former footballer who played as a midfielder.

Luíz Cruls or Luís Cruls or Louis Ferdinand Cruls was a Belgian-Brazilian astronomer and geodesist. He was Director of the Brazilian National Observatory from 1881 to 1908, led the commission charged with the survey and selection of a future site for the capital of Brazil in the Central Plateau, and was co-discoverer of the Great Comet of 1882. Cruls was also an active proponent of efforts to accurately measure solar parallax and towards that end led a Brazilian team in their observations of 1882 Transit of Venus in Punta Arenas, Chile.

Ri Se-gwang is a North Korean artistic gymnast, representing the April 25 Sports Club. He can easily be considered a specialist on vault apparatus within the sport of men’s artistic gymnastics.

Sattam bin Abdulaziz was one of the senior members of the House of Saud and the 12th governor of the Riyadh Province.

Augustin Bon Joseph de Robespierre was the younger brother of French Revolutionary leader Maximilien Robespierre. His political views were similar to his brother's. During the Battle of Toulon (1793), he became a supporter of Napoleon, nicknamed "Robespierre on horse". When his brother was arrested on 9 Thermidor, Robespierre volunteered to be arrested as well, and he was executed by guillotine like Maximilien and 20 other counter-revolutionaries.

Max-Emanuel Ludwig Maria Herzog in Bayern as the younger son of Albrecht, Duke of Bavaria, is the heir presumptive to both the headship of the former Bavarian royal house and the Jacobite succession. He was born a Prince of Bavaria, as a member of the royal line of the House of Wittelsbach, but has been using the title "Herzog in Bayern" or Duke in Bavaria, since he was adopted as an adult by his great-uncle, Duke Ludwig Wilhelm in Bavaria, the last bearer of that title of a junior branch of the House of Wittelsbach, from whom he inherited considerable estates at Tegernsee Abbey, Banz Abbey and Kreuth.