Kolchak, Kolçak or Kolčák is a surname from Turkish kolçak. Notable people with the surname include:

• Alexander Kolchak (1874–1920), Russian naval commander, head of anti-Bolshevik White forces
• Erkan Kolçak Köstendil, Turkish actor, director and former footballer
• Eşref Kolçak (1927–2019), Turkish actor
• Iliash Kolchak ("Kolchak-Pasha") (fl. before 1710–1743), Moldavian mercenary and military commander
• Kristián Kolčák (born 1990), Slovak football midfielder
• Sibel Kolçak, Turkish female football referee

• Carl Kolchak from Kolchak: The Night Stalker, an American television series

• All pages with titles containing Kolchak
• All pages with titles containing Kolcak
• Kolchak Island, an island in the Kara Sea
• Colceag