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, German Speedway racer
Mike Dilger (born 1966), British ecologist and natural history presenter