Klaus Kinski, German actor
Klaus Meine, lead singer of German hard rock band The Scorpions
Klaus Badelt, German composer, most famous work to date is from Pirates of the Caribbean
Klaus von Klitzing, winner of the Nobel Prize in Physics
Niklaus "Klaus" Mikaelson, character from "The Vampire Diaries" and "The Originals"
Klaus Baudelaire, from "A Series of Unfortunate Events"
Klaus Goldstein, date able character from Shall we Date?Wizardess Heart older brother of Elias Goldstein