- He had a relationship with actress Veronica Ferres for nine years in the 1990s.
- Good friends with author Patrick Süskind, co-author of Dietl's biggest hits Kir Royal (1986) and Rossini (1997).
- Received the "Bayerischer Verdienstorden" (highest Bavarian order) (14 July 2005).
- Member of the 'Official Competition' jury at the 48th Berlin International Film Festival in 1998.
- Studied theater science and art history.
- Has always lived in the Munich neighborhood Schwabing.
- Children: Sharon (b. c. 1969), with Karin Dietl-Wichmann; David Dietl (b. 1979), with Marianne Dennler; and Serafina Marie (b. 15 July 2003), with Tamara Duve.
- Son in law of Freimut Duve.
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