Cieplak is a Polish language family name. Notable people with the surname include:
Jan Cieplak (1857–1926) Polish archbishop Marian Cieplak (1893–1966), Polish diplomat and statesman Paweł Cieplak (born 1966), Polish diplomat Piotr Cieplak (1960–2025), Polish theatre director Ursula Cieplak, a protagonist of a Polish telenovela BrzydUla