Vasili Mikhailovich Altfater (Альтфатер, Василий Михайлович in Russian) (1883 — April 20, 1919), Russian-Soviet naval officer, first Commander-in-chief of the Soviet Navy.

Altfater graduated from Naval College (1902) and Naval Academy's Department of Hydrography (1908). During the Russo-Japanese War, Altfater participated in the defense of Port Arthur (Lüshunkou) and rescue of the crew of the battleship Petropavlovsk. Later on, Altfater served as the flagship navigator at the Headquarters of the Commander of the 1st Mining division of the Baltic Fleet (1909-1910). During the World War I, Altfater was a spokesperson for the Imperial Russian Navy , then head of the Military Administration under the Commander-in-chief of the Northern Fleet. In October of 1917, Altfater was promoted to the rank of Rear-Admiral. After the October Revolution, he joined the Soviets. In February of 1918, Altfater was appointed assistant to the head of the Naval Headquarters. He participated in peace negotiations in Brest-Litovsk. In April, Altfater became a Board member at the People's Commissariat of Naval Affairs. In October, he became a member of the Revolutionary Military Council (Реввоенсовет (Revvoensovet), or Revolutsionniy voenniy sovet) and appointed Commander-in-chief of the Soviet Naval Forces.

Altfater died of a heart attack in Moscow on April 20, 1919. On receiving the news about his death, Leon Trotsky said that “the Red Fleet lost a tireless, competent, energetic and honest worker”.