•
Brother Klaus, Swiss patron saint •
Klaus Augenthaler (born 1957), German football player and manager •
Klaus Badelt (born 1967), German composer •
Klaus Barbie (1913–1991), German SS-Hauptsturmführer and Holocaust Perpetrator •
Klaus Bargsten (1911–2000), German captain and sole survivor of the sunken U-boat U-521 in World War II •
Klaus Berntsen (1844–1927), Danish politician •
Klaus Dede (1935–2018), German writer •
Klaus Dibiasi (born 1947), Italian sports diver •
Klaus Doldinger (1936–2025), German saxophonist and film music composer •
Klaus Fischer (born 1949), German footballer •
Klaus Flouride (born 1949), bassist of the Dead Kennedys •
Klaus Fuchs (1911–1988), German theoretical physicist and atomic spy •
Klaus Gerhart (born 1965), outdoorsman and photographer •
Klaus Iohannis (born 1959), Romanian politician •
Klaus Isekenmeier (born 1975), German decathlete •
Klaus Kinkel (1936–2019), German politician •
Klaus Kinski (1926–1991), German actor •
Klaus Lemke (1940–2022), German film director •
Klaus Köchl (born 1961), Austrian politician •
Klaus Lage (born 1950), German musician •
Klaus Lanzarini (born 1977), Italian freestyle swimmer •
Klaus Laser (1942–2020), German actor •
Klaus Löwitsch (1936–2002), German actor •
Klaus Mäkelä, (born 1996) Finnish conductor and cellist •
Klaus Meine (born 1948), lead singer of German hard rock band
Scorpions •
Klaus Mertens (born 1949), German singer •
Klaus Nomi (1944–1983), German entertainer •
Klaus Ofczarek (1939–2020), Austrian opera singer and actor •
Klaus Perwas (born 1971), German basketball coach and former player •
Klaus Rinke (1939–2026), German artist •
Klaus Rogge (born 1979), German rower •
Klaus Schilling (1871–1946), German experimenter in Nazi human concentration camp experiments executed for war crimes •
Klaus Schulten, computational biophysicist •
Klaus Schulze (1947-2022), German electronic music composer and musician •
Klaus Schwab (born 1938), German professor who founded the
World Economic Forum •
Klaus Seltenheim (born 1984), German politician •
Klaus Tennstedt (1926–1998), German conductor •
Klaus Voormann (born 1938), artist, musician, and record producer who was associated with the early days of The Beatles •
Klaus Voussem (born 1970), German politician •
Klaus Wowereit (born 1953), German politician
Pen name •
Klaus Maria Brandauer (born 1943), theatrical name of Klaus Georg Steng, Austrian actor ==Characters==