
Sieghardt Rupp (14 June 1931 – 20 July 2015) was an Austrian actor who performed in film, television and theatre.
He made over 55 film and TV appearances beginning in 1959, with his career peaking in the 1960s. He became known for his performances in gangster or Western films in the 1960s where he typically portrayed a bandit or mercenary. His dark features, similar to those of his Italian co-stars meant that he could play Latin characters, such as Mexicans.
His most noted Western performance was his role as Esteban Rojo in Sergio Leone's 1964 production A Fistful of Dollars alongside Clint Eastwood and Gian Maria Volonté. He appeared in many other Westerns in the 1960s such as Blood at Sundown (1966) although he appeared in the romantic adventure Angelique and the Sultan in 1968.

A Fistful of Dollars
1964 · as Esteban Rojo

Don't Look Now... We're Being Shot At!
1966 · as Lieutenant Sturmer

Breakthrough
1979 · as Corporal Rothe

Angelique and the Sultan
1968 · as Millerand

Five Golden Dragons
1967 · as Peterson

Frontier Hellcat
1964 · as Preston

Untamable Angelique
1967 · as Millerand

Die Försterchristel
1962 · as Franz Földessy aka Rittmeister Franz Koltai

The Fountain of Love
1966 · as Nils Hansen

The Sweet Pussycats
1969 · as Oberst

Narrenspiegel
1971 · as Parocki

Stop Train 349
1963 · as Eugen

Case 33: Antwerp
1964 · as Jack van Druten

Don Juan kommt zurück
1963 · as Don Juan

Hochspannung
1967 · as Alfred Schindler

The Brazen Women of Balzac
1969 · as Georg

Am Galgen hängt die Liebe
1960 · as Petros

Lulu
1962 · as Maler Schwarz