Dieter Pfaff (2 October 1947 – 5 March 2013) was a German actor and director.The son of a police officer, Pfaff was best known as police officer Hans Sperling in the series Sperling. Sperling also appeared in two films about Swedish policeman Martin Beck, namely Flickan i jordkällaren and Den japanska shungamålningen. In 2002, he starred in Goebbels und Geduldig. Between 1984 and 1996, he played Otto Schatzschneider in the German krimi series Der Fahnder.

Pfaff and his wife Eva Maria Emminger had two children, twins Johanna and Maximilian. Pfaff was professor for acting at the Graz University of Music and Performing Arts from 1983 until 1990.