Christoph Waltz (German: [ˈkʁɪstɔf ˈvalts]; born 4 October 1956) is an Austrian and German actor. Primarily active in the United States, he gained international recognition for his portrayal of villainous and supporting roles in English-language films. His accolades include two Academy Awards, two Golden Globe Awards, two BAFTA Awards, two Screen Actors Guild Awards, two Critics' Choice Movie Awards in addition to nomination for an Emmy Award.

After a substantial career in German television and theatre, Waltz's American breakthrough role came in Quentin Tarantino's 2009 film Inglourious Basterds, in which he played Hans Landa, for which he received the Academy Award for Best Supporting Actor and the Cannes Film Festival Best Actor Award. He collaborated with Tarantino again in Django Unchained (2012), for which he earned his second Academy Award for Best Supporting Actor, this time for his performance as a bounty hunter named Dr. King Schultz.

He has also starred in Carnage (2011), The Zero Theorem (2013), Big Eyes (2014), Downsizing (2017), Alita: Battle Angel (2019), and The French Dispatch (2021). He appeared as Ernst Stavro Blofeld in the James Bond films Spectre (2015) and No Time to Die (2021).

Waltz was born on 4 October 1956 in Vienna, the son of Johannes Waltz, a German set designer, and Elisabeth Urbancic, an Austrian costume designer of Austrian and Slovenian descent. Waltz comes from a family of theatrical heritage: his maternal grandmother was Burgtheater and silent film actress Maria Mayen, and his step-grandfather, Emmerich Reimers, and his great-grandfather, Georg Reimers, were both stage actors who also appeared in silent films. Waltz's maternal grandfather, Rudolf von Urban, was a psychiatrist of Slovene descent and a student of Sigmund Freud. Waltz's father died when he was seven years old and his mother later married composer and conductor Alexander Steinbrecher. Steinbrecher was previously married to the mother of director Michael Haneke; as a result, Waltz and Haneke shared the same stepfather.

Waltz had a passion for opera as a youth, having seen his first opera (Turandot with Birgit Nilsson in the title role) at around the age of ten. As a teenager, Waltz would visit the opera twice a week. He was uninterested in theatre and wished to become an opera singer. After graduating from Vienna's Theresianum, Waltz went to study acting at the renowned Max Reinhardt Seminar. At the same time, he also studied singing and opera at the University of Music and Performing Arts Vienna, but eventually decided that his voice was not good enough for an opera career. In the late 1970s, Waltz spent some time in New York City where he trained with Lee Strasberg and Stella Adler. He studied script interpretation under Adler and credits his analytical approach to her teaching.

On his return to Europe, Waltz found work as a stage actor, making his debut at the Schauspielhaus Zürich. He also performed in Vienna, Salzburg, Cologne and Hamburg. He became a prolific television actor in the years 1980 to 2000. In 2000, he made his directorial debut, with the German television production Wenn man sich traut. In 1990, he played Dr. Hans-Joachim Dorfmann in the British TV series The Gravy Train opposite Ian Richardson. The show is a story of intrigue and misdeeds set in the offices of the European Union in Brussels. In 2007, Waltz narrated the audiobook of Robert Sapolsky's German version of A Primate's Memoir, Mein Leben als Pavian.

In Quentin Tarantino's 2009 film Inglourious Basterds, Waltz portrayed SS-Standartenführer Hans Landa, also known as "The Jew Hunter". Clever, courteous, multilingual—but also self-serving, implacable and murderous—the character of Landa was such that Tarantino feared he "might have written a part that was un-playable". Waltz received the Best Actor Award for the performance at the 2009 Cannes Film Festival and received acclaim from critics and the public. In 2009, he began sweeping critics' awards circuits, receiving awards for Best Supporting Actor from the New York Film Critics Circle, the Boston Society of Film Critics, Los Angeles Film Critics Association, as well as Best Supporting Actor awards at the Golden Globes and the Screen Actors Guild Awards.

The following month, he won the BAFTA for Best Supporting Actor, and won the Academy Award for Best Supporting Actor. Tarantino acknowledged the importance of Waltz to his film by stating: "I think that Landa is one of the best characters I've ever written and ever will write, and Christoph played it to a tee. It's true that if I couldn't have found someone as good as Christoph I might not have made Inglourious Basterds".