Klatt is a surname. Notable people with the surname include:
Bernard Klatt, former Canadian internet service provider Bill Klatt (1947–2011), retired professional ice hockey player Dennis H. Klatt, (1938–1988), American researcher in speech and hearing science Dusty Klatt, professional motocross racer from Campbell River, British Columbia, Canada Friedrich Wilhelm Klatt (1825–1897), German botanist who specialised in the study of African plants Joel Klatt (born 1982), currently a talk radio personality on 102 Johannes Klatt (1852–1908), Prussian–German Indologist and librarian Marcin Klatt (born 1985), Polish footballer who plays for Pogoń Szczecin Paul Klatt (1896–1973), German general who commanded the 3. Gebirgs-Division Trent Klatt (born 1971), retired American professional ice hockey right winger Werner Klatt (born 1948), German rower who competed for East Germany in the 1976 Summer Olympics
See also Klaatu, a character in the 1951 film The Day the Earth Stood Still