Hans-Dieter Bader (16 February 1938 – 18 June 2022) was a German operatic tenor. He performed for decades in leading roles as both a dramatic and a lyrical tenor at the Staatsoper Hannover. He appeared in around 90 operatic roles, as well as in concert and oratorio. His recordings include the operas Feuersnot by Richard Strauss and Ermanno Wolf-Ferrari's Sly, and the concert premiere of Max Reger's unfinished Dies irae.