The Battle of Sinop, or the Battle of Sinope, was a naval battle that took place on 30 November 1853 between Imperial Russia and the Ottoman Empire, during the opening phase of the Crimean War (1853–1856). It took place at Sinop, a sea port on the southern shore of the Black Sea. A Russian squadron attacked and decisively defeated an Ottoman squadron anchored in Sinop's harbor. The Russian force consisted of six ships of the line, two frigates and three armed steamers, led by Admiral Pavel Nakhimov; the Ottoman defenders were seven frigates, three corvettes and two armed steamers, commanded by Vice Admiral Osman Pasha.

The Crimean War was fought from October 1853 to February 1856 between the Russian Empire and an ultimately victorious alliance of the Ottoman Empire, France, the United Kingdom, and Sardinia-Piedmont.