Dieter "Didi" Hallervorden (born 5 September 1935) is a German comedian, actor, singer, and cabaret artist.

In the early 2010s, he was able to increasingly establish himself as a character actor of serious roles in films such as Back on Track (2013) and Head Full of Honey (2014).

Dieter Hallervorden's mother was a physician's assistant and his father a graduate engineer employed by German aircraft maker Junkers.

Dieter Hallervorden Jr. appeared in the movies Darf ich Sie zur Mutter machen (1968) and The Wedding Trip (1969) and was creator, co-writer and leading actor of the comedy show Nonstop Nonsens (1974–1980).

In recent years, Hallervorden was popular with the leading roles in the comedy-drama films Back on Track and Head Full of Honey.