List of Famous people named Otto

Otto III, a member of the Wittelsbach dynasty, was the Duke of Lower Bavaria from 1290 to 1312 and the King of Hungary and Croatia between 1305 and 1307. His reign in Hungary was disputed by Charles Robert of the Angevin dynasty.

Prince Otto of Windisch-Graetz was an Austrian nobleman, who became known through his marriage to Archduchess Elisabeth Marie of Austria, the so-called “Red Archduchess”.

Otto Fretter-Pico was a German general in the Wehrmacht during World War II. A veteran of WWI and the younger brother of General Maximilian Fretter-Pico, he took part in operations from Poland to France, and from the Soviet Union to Italy. Fretter-Pico commanded artillery units before commanding the 57th Infantry Division and the 148th Infantry Division. He was a recipient of the Knight's Cross of the Iron Cross of Nazi Germany.

Otto Küsel is considered to be an example of a prisoner functionary in Nazi concentration camp, who used his position in favour of other prisoners.

Otto III, Duke of Brunswick-Lüneburg, Lord of Harburg was a titular Duke of Brunswick-Lüneburg and ruler of the apanage Brunswick-Harburg.

Otto III, called the White and known as Otto of Schweinfurt, was the margrave of the Nordgau (1024–1031) and duke of Swabia (1048–1057). He was the son of Henry of Schweinfurt, margrave of the Nordgau, and Gerberga of Henneberg. He was one of the most powerful East Franconian princes by inheritance: having extensive land in the Radenzgau and Schweinfurt. In 1014, he first appears as count of Lower Altmühl and, in 1024, he inherits his father's march. In 1034, he became count of the Lower Naab. From then on to his appointment to Swabia, he takes part in many imperial expeditions into Bohemia, Hungary, and Poland.

Otto Friedrich von Gierke was a German legal scholar and historian. In his four-volume magnum opus entitled Das deutsche Genossenschaftsrecht, he pioneered the study of social groups and the importance of associations in German life, which stood between the divide of private and public law. During his career at Berlin University's law department, Gierke was a leading critic of the newly drafted German Civil Code, arguing that it had been moulded in an individualistic frame that was inconsistent with German social traditions. He helped to advance the concept of social law, over the classical division of public law and private law.

Otto, Lord of Lippe was the ruling Count of Lippe-Lemgo from 1344 until his death.

Otto the Evil was a member of the House of Guelph. He was a Duke of Brunswick-Lüneburg, from 1367 Duke in the Principality of Göttingen.