Tetzlaff is a surname. It is a German rendering of a West Slavic personal name. The surname may refer to:

• Christian Tetzlaff (born 1966), German violinist, brother of Tanja
• Dale H. "Ted" Tetzlaff (1903–1995), American cinematographer
• 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
• Tanja Tetzlaff (born 1973), German cellist, sister of Christian
• Teddy Tetzlaff (1883–1929), American racecar driver
• Toni Tetzlaff (1871–1947), German actress
• Walter Tetzlaff (1915–1975), American child actor
• Wolfram Tetzlaff (born 1954), German-Canadian neuroscientist

• Tetzlaff Peak, a mountain in Utah, US
• Tetzlav (before 1163 – between 1170 and 1181), Prince of Rügen
• All pages with titles containing Tetzlaff