Tetzlaff is a surname. It is a German rendering of a West Slavic personal name. Notable pepople with the surname include:Charles Tetzlaff, American attorney from Vermont
Christian Tetzlaff, German violinist, brother of Tanja
Dale H. "Ted" Tetzlaff (1903–1995), American cinematographer
Dieter Tetzlaff, East German speedway rider
Doris Tetzlaff (1921–1998), American baseball player
Dörthe Tetzlaff, German geologist
Percy Tetzlaff (1920–2009), New Zealand rugby player
Rob Tetzlaff (1935–2012), American Olympic cyclist
Sarah Tetzlaff, New Zealand speed climber
Tanja Tetzlaff, German cellist, sister of Christian
Teddy Tetzlaff (1883–1929), American racecar driver
Toni Tetzlaff (1871–1947), German actress
Walter Tetzlaff, birth name of Walter Tetley (1915–1975), American child actor