Fendler is a German surname. Notable people with the surname include:
Augustus Fendler (1813–1883), Prussian-born American natural history collector Bud Fendler (1935-2024), American politician from Missouri Donn Fendler (1926–2016), American whose disappearance launched a manhunt Lothar Fendler (1913–1983), German SS officer and Holocaust perpetrator