Cossacks are an ethnic group originating in Ukraine and southern Russia.

Cossack or Cossacks may also refer to:

• The Cossacks (novel), by Leo Tolstoy

• The Cossacks (1928 film), an American silent drama film
• The Cossacks (1960 film), starring Edmund Purdom
• The Cossacks (1961 film), based on the novel
• Cossacks (cartoon series), a long-running Ukrainian series of short films established in 1967

• Cossacks, a real-time strategy video game series
  • Cossacks: European Wars, a 2001 Ukrainian made video game
  • Cossacks II: Napoleonic Wars, its sequel
  • Cossacks 3, the third game in the series
• Doctor Cossack, a character in the video game Mega Man 4

• HMS Cossack, various British Royal Navy ships
• USS Cossack (1861), a Union Navy bark during the American Civil War
• USS Cossack (SP-695), a patrol boat in commission from 1917 to 1919
• Antonov An-225 Mriya, a Soviet cargo aircraft, NATO reporting name Cossack
• Sunbeam Cossack, a British 12-cylinder aero engine developed during the First World War
• Persian Cossack Brigade, a former military force in Iran

• Cossack, Northern Territory, a suburb of the town of Katherine
• Municipality of Cossack, Western Australia, a former local government area
  • Cossack, Western Australia, a ghost town within the former municipality

• Cossack (ship), various ships
• Cossack motorcycle, brand name for several motorcycles made in the former Soviet Union
• Cossack, a model of the Lada Niva Russian automobile

• Cossacks Motorcycle Club, an American motorcycle gang
• Peter the Cossack (died 1592), Prince of Moldavia in 1592, also known as simply the Cossack
• Cossack (horse) (1844–after 1862), also known as The Cossack, a British thoroughbred racehorse
• Eskimo bowline, also called a Cossack knot, a type of knot

• Cassock, an ankle-length clerical robe
• Lajos Kassák (1887–1967), Hungarian poet, novelist, painter, essayist, editor and theoretician of the avant-garde
• Kazak (disambiguation)
• Kazakh (disambiguation)
• Kazaky, a Ukrainian pop band

• All pages with titles beginning with Cossack
• All pages with titles containing Cossack