Peter Simonischek (6 August 1946 – 29 May 2023) was an Austrian actor. He was a celebrated stage performer and a regular ensemble member of the Burgtheater from 1999. He often appeared at the Salzburg Festival and had played the title role in the play Jedermann numerous times.

In addition, he also appeared in more than sixty films since 1980. Simonischek was perhaps best-known to international audiences for his leading role in the critically acclaimed comedy-drama Toni Erdmann (2016).

Simonischek grew up in Markt Hartmannsdorf, a municipality in the state of Styria, where his father was a dentist. His sons, Max Simonischek and Kaspar Simonischek, are also actors.

Simonischek died on 29 May 2023, at the age of 76.