- Spoke fluent German, English, French, Spanish, Italian and Russian.
- Died in intensive care of pneumonia while recovering from a broken thighbone.
- Called "the German James Dean" because he was typecast as a rebellious teenager in the late 1950s.
- Lived in Paris and Switzerland with his wife Myriam Bru. They also had a daughter, Beatrice.
- Christopher Buchholz directed Horst Buchholz... mein Papa (2005), which deals with his father's life and their relationship.
- Among many others, he turned down the lead role in A Fistful of Dollars (1964). The role went on to make Clint Eastwood a star.
- During the filming of One, Two, Three (1961), he was seriously hurt in a car accident that prevented him from shooting for over two months.
- His participation in Billy Wilder's One, Two, Three (1961) was the reason that he was unable to be in Lawrence of Arabia (1962). Omar Sharif later received his first--and thus far, only--Oscar nomination for playing the role originally intended for Buchholz.
- Son of a shoemaker, he dropped out of school so he could take acting lessons.
- Having established himself in theatre and radio work and able to speak several languages, he got into film work by dubbing voices on foreign films. One of these was Walt Disney's Pinocchio (1940) which, due to the war, wasn't released in Germany until 1951. He dubbed the voice of Lampwick.
- He received tribute as part of the annual "In Memoriam" segment at the 75th Annual Academy Awards, 2003.
- Is buried in the Heerstraße Cemetery, Berlin.
- Despite being of German/Danish background, he has portrayed a variety of roles that include a Mexican gunman (The Magnificent Seven (1960)), a Russian soldier (Sky Without Stars (1955)), a Polish sailor (Tiger Bay (1959)), and an Italian painter (The Empty Canvas (1963)).
- Father of Christopher Buchholz.
- His first foreign film was the British drama Tiger Bay (1959).
- Landed his first stage role at 15 in a Berlin theater version of the German children's classic "Emil and the Detectives."
- Is one of only two German actors to play Johann Strauss. He did so in The Great Waltz (1972). The other actor was Alfred Abel in the silent film Strauss, the Waltz King (1928).
- Was to star as Charles Wilder in The Cat and the Canary (1978) but pulled out at the last minute. The producers seriously considered suing him for his actions.
- Made his Broadway debut with "Cherie," which starred Kim Stanley, in 1959.
- In 1981 he failed as host Astro-Show Ein Spiel mit den Sternen (1981) on German TV, which was canceled after only five shows. In the show, the popular astrologer Elizabeth Teissier had been his sidekick.
- He began on stage in German drama. By his third film, Sky Without Stars (1955), he'd won the German National Film Prize and within two years of his film debut he was voted Most Popular German actor on stage and film.
- Considered for Dr. Hans Fallada and Dr. Bukovsky in Lifeforce (1985).
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