OT or Ot may refer to:
Ottawa (/ˈɒtəwə/ or /ˈɒtəwɑː/; French pronunciation: [ɔtawa]) is the capital city of Canada. It stands on the south bank of the Ottawa River in the eastern portion of southern Ontario.
Otto Eduard Leopold, Prince of Bismarck, Duke of Lauenburg (1 April 1815 – 30 July 1898), known as Otto von Bismarck (German pronunciation: [ˈɔtoː fɔn ˈbɪsmark]), was a conservative Prussian statesman who dominated German and European affairs from the 1860s until 1890. In the 1860s, he engineered a series of wars that unified the German states, significantly and deliberately excluding Austria, into a powerful German Empire under Prussian leadership.
The Ottawa Senators (French: Sénateurs d'Ottawa) are a professional ice hockey team based in Ottawa, Ontario, Canada.
Otis Ray Redding, Jr. (September 9, 1941 – December 10, 1967) was an American singer, songwriter, record producer, arranger, and talent scout.
Otto I (23 November 912 – 7 May 973), traditionally known as Otto I the Great (German: Otto I. der Große), was German king from 936 and emperor of the Holy Roman Empire from 962 until his death in 973. He was the oldest son of Henry I the Fowler and Matilda.