Kolchak, Kolçak or Kolčák is a surname. Notable people with the surname include:
- Iliash Kolchak ("Kolchak-Pasha") (fl. before 1710–1743), Moldavian mercenary and military commander
- Alexander Kolchak (1874–1920), Russian naval commander, head of anti-Bolshevik White forces
- Eşref Kolçak (1927–2019), Turkish actor
- Kristián Kolčák (born 1990), Slovak football midfielder
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