The House of Romanov (; also Romanoff; , ''Románovy'', ) was the reigning dynasty in Russia from 1613 until the abdication of TsarNicholas II on 15 March 1917, as a result of the February Revolution. The House of Romanov was the second dynasty to rule Russia, the first being the House of Rurik.
The direct male line of the Romanovs came to an end when Elizabeth of Russia died in 1762. After an era of dynastic crisis, the House of Holstein-Gottorp, a cadet branch of the House of Oldenburg that reigned in Denmark, ascended the throne in 1762 with Peter III, a grandson of Peter I. All rulers from the middle of the 18th century to the revolution of 1917 were descended from that branch. Though officially known as the ''House of Romanov'', these descendants of the Romanov and Oldenburg dynasties are sometimes referred to as Holstein-Gottorp-Romanov.