All articles starting with O
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Otto Wallin
Otto Wallin (Einar Otto Wallin, born 1990), Swedish southpaw heavyweight boxer from Sundsvall, nicknamed All In. Record 28-4, 1 NC (16 KOs); pushed Tyson Fury 12 rounds in 2019, lost to Anthony Joshua in 2023 and Derek Chisora in 2025.
Otto Warburg (biochemist)
Otto Warburg (1883–1970) was a German biochemist who won the 1931 Nobel Prize for his work on the respiratory enzyme and described the Warburg effect in cancer.
Otto Warmbier
Otto Warmbier, born Otto Frederick Warmbier, was an American University of Virginia student detained in North Korea for 17 months who died days after his 2017 release.
Otto Wels
Otto Wels (1873–1939), SPD chairman 1919–1933 and Reichstag deputy, co-founded the Reichsbanner and Iron Front, led the sole parliamentary vote against Hitler's 1933 Enabling Act, then built the SPD exile organization Sopade in Prague and Paris, dying there in September 1939.
Otto Westphal
Otto Westphal (1913–2004) was a German chemist and immunologist who established the chemistry of bacterial endotoxins and developed the hot phenol–water method for purifying lipopolysaccharide.
Otto Wiener (physicist)
Otto Wiener (1862–1927) was a German physicist whose 1890 experiment photographed standing light waves, showing that the electric component of light drives the chemical effect.
Otto Wilhelm von Struve
Otto Wilhelm von Struve, known in Russian as Otto Vasil'evich Struvé, was a Russian astronomer who directed the Pulkovo Observatory from 1862 to 1889 and discovered over 500 double stars.
Otto Wille
Otto Wille, German freestyle swimmer from Gleiwitz; 1934 European 100 m freestyle bronze medalist and German champion, 1938 4x100 m relay world record holder; killed at the Eastern Front.
Ottobah Cugoano
Ottobah Cugoano, baptized John Stuart, was a Fante-born Ghanaian writer and abolitionist in England who in 1787 published a book calling for the immediate abolition of slavery.
Ottobock
Ottobock is a German medical technology company founded in Berlin in 1919 by prosthetist Otto Bock, headquartered in Duderstadt and making prosthetics, orthotics, exoskeletons, and wheelchairs.
Ottokar I of Bohemia
Ottokar I of Bohemia (Přemysl Otakar I, c. 1160s to 1230) was Duke of Bohemia and King of Bohemia from 1198, securing the crown as hereditary.
Ottokar II of Bohemia
Ottokar II of Bohemia, also known as Přemysl Otakar II, was king of Bohemia from 1253 to 1278, called the Iron and Golden King, and died at the Battle of Marchfeld in 1278.
Ottokar Weise
Ottokar Weise (born before 1890, died after 1900), German regatta sailor of the Berliner Yacht-Club; crew of Aschenbrödel at Paris 1900, winning Olympic gold in the 1-2 ton class and silver in the open class.
Ottoline Leyser
Ottoline Leyser is a British plant biologist at Cambridge who studies auxin and shoot branching and led UK Research and Innovation from 2020 to 2025.
Ottoman (furniture)
An ottoman is a low, upholstered, backless piece of furniture used as a footrest, extra seat, or storage-footrest hybrid, named after a European fashion for Turkish style.
Ottoman Administrative Decentralization Party
The Ottoman Administrative Decentralization Party (حزب اللامركزية الإدارية) was an Arab reform party founded in Cairo in 1912 by Syrian emigres, which organized the First Arab Congress in Paris in 1913.
Ottoman annexation of Germiyan
The Ottoman annexation of Germiyan (Germiyan'in ilhaki) was the two-stage absorption of the Germiyanid beylik into the Ottoman state, beginning in 1381 with a dowry cession.
Ottoman annexation of Karesi
The Ottoman annexation of Karesi was the incorporation of the Karesi beylik of western Anatolia into the Ottoman state under Orhan Bey by 1360, giving the Ottomans the Marmara coast.
Ottoman aqueducts in the Balkans and Istanbul
Ottoman aqueducts are water-supply bridges and covered galleries built under Ottoman rule from the mid-sixteenth century onward, with the Kırkçeşme system, ordered by Süleyman the Magnificent in 1554, supplying Istanbul.
Ottoman architecture
Ottoman architecture, also called Ottoman Turkish architecture, is the building tradition of the Ottoman Empire, emerging in Bursa and Edirne and culminating in Sinan's 16th-century mosques.
Ottoman beylik
The Ottoman beylik (Osmanoghullari) was a Turkmen frontier principality in northwestern Anatolia founded by Osman I around 1300, which expanded under Orhan and Murad I into the Ottoman Empire.
Ottoman Caliphate
The Ottoman Caliphate: the Ottoman sultans' claim to the caliphate, from Selim I's 1517 conquest of Egypt through Abdülhamid II's pan-Islamism to its abolition by the Turkish Parliament on March 3, 1924.
Ottoman Caliphate under Abdülmecid II
The Ottoman Caliphate under Abdülmecid II (خلافت عبدالمجيد الثانى) was the final tenure of the Ottoman caliphate, a purely spiritual office held by Abdülmecid Efendi from 1922 to 1924.
Ottoman calligraphy
Ottoman calligraphy, known in Turkish as hat sanatı, is the Ottoman art of Arabic-script writing with a reed pen, practiced from the 14th century until 1928.
Ottoman capture of Béjaïa
The Ottoman capture of Béjaïa, or Capture of Bougie, took place in September 1555, when Salah Rais, ruler of Algiers, took the fortified port city from its Spanish garrison.
Ottoman census of 1905–1906
The Ottoman census of 1905–1906 (تعداد ١٩٠٥) was a population count of the Ottoman Empire, generally treated as the last full census of the Ottoman period.
Ottoman clothing
Ottoman clothing is the dress of the Ottoman Empire, worn from the late 13th century until 1922. It featured layered robes and silk textiles that signaled status.
Ottoman Code of Civil Procedure of 1879
The Ottoman Code of Civil Procedure of 1879 (قانون محاكم نظاميه), drafted by the Mecelle Cemiyeti and modeled on French law, governed civil cases in the nizamiye courts until 1927.
Ottoman Code of Judicial Nizamiye Organization (1880)
The Ottoman Code of Judicial Nizamiye Organization (قانون تشكيل محاكم) is the 1879 Ottoman law organizing the nizamiye courts, issued by the Ministry of Justice.
Ottoman Commercial Code of 1850
The Ottoman Commercial Code of 1850 (قانون تجارت, Kanunname-i Ticaret) was the empire's first commercial code, translated from the French Code de Commerce and repealed in 1926.