Viertel is a surname. Notable people with the surname include:
Berthold Viertel (1885–1953), Austrian screenwriter and film director Elisabeth Neumann-Viertel (1900–1994), Austrian actress Joel Viertel, director of the 2008 comedy film Strictly Sexual Peter Viertel (1920–2007), American author and screenwriter Salka Viertel (1889–1978), actress and screenwriter