Klaus Badelt (born 1968) is a German composer, best known for composing film scores.

Badelt was born in Frankfurt, Germany. He started his musical career composing for many successful movies and commercials in his homeland. In 1998, Oscar-winning film composer Hans Zimmer invited Badelt to work at Media Ventures in Santa Monica, his studio co-owned by Jay Rifkin. Since then, Badelt has been working on a number of his own film and television projects such as The Time Machine and K-19: The Widowmaker. He has also collaborated with other Media Ventures composers, such as Harry Gregson-Williams, John Powell, and Zimmer.
While collaborating with Zimmer, Badelt has contributed to the Oscar-nominated scores for The Thin Red Line and The Prince of Egypt, as well as writing music for many well known directors including Ridley Scott, Tony Scott, Terrence Mallick, John Woo, Kathryn Bigelow, Jeffrey Katzenberg, Tom Cruise, Sean Penn, Gore Verbinski, and Steven Spielberg.

Badelt co-produced the score to Hollywood box office hit Gladiator, directed by Ridley Scott, as well as writing portions of the score with singer/composer Lisa Gerrard. Having contributed music to Gladiator, Mission: Impossible 2 and Michael Kamen's score for X-Men, Badelt was involved in the three most successful movies in 2000. Badelt also collaborated with Zimmer on other successful films, such as The Pledge, and 2001 blockbusters Hannibal and Pearl Harbor. One of his more famous - and more popular - scores is the score to the 2003 film Pirates of the Caribbean: The Curse of the Black Pearl.

Among Badelt's most critically celebrated scores are the Chinese fantasy film The Promise and Dreamworks' remake of The Time Machine, the latter which earned him the Discovery of the Year Award at the World Soundtrack Awards 2003.