Dilger is a surname. Notable people with the surname include:
Anton Dilger (1884–1918), German-American physician Hubert Dilger (1836–1911), decorated German immigrant in the Union Army during the American Civil War Ken Dilger (born 1971), retired American football player Max Dilger (born 1989), German Speedway racer Mike Dilger (born 1966), British ecologist and natural history presenter