•
Abraham Janssen (c. 1699–1765), British baronet politician, son of Theodore Janssen •
Abraham Janssen (chessplayer) (1720–1795), British chess player •
Albert-Édouard Janssen (1883–1966), Belgian monetary theorist and Minister of State •
Anne Janssen (born 1982), German politician •
Anton Janssen (born 1963), Dutch footballer •
Arnold Janssen (1837–1909), German-Dutch Roman Catholic priest, missionary and saint •
Ben Janssen, Dutch heavy metal guitarist •
Benno Janssen (1874–1964), American architect •
Benny Janssen (born c. 1960), Dutch sidecarcross rider •
Brian Janssen (born 1962), Australian boxer •
Bryan Janssen (born 1995), Dutch football goalkeeper •
Cam Janssen (born 1984), American ice hockey player •
Camille Janssen (1837–1926), Belgian Governor-General of the (Congo 1886–1892) •
Casey Janssen (born 1981), American baseball player for the Washington Nationals •
Charles-Emmanuel Janssen (1907–1986), Belgian businessman and politician, son of Emmanuel Janssen •
Charlie Janssen (born 1971), American politician •
Constant Janssen (1895–1970), Belgian physician and founder of the predecessor of Janssen Pharmaceutica •
David Janssen (1931–1980), American actor •
Dennis Janssen (born 1992), Dutch footballer •
Diego Janssen (born 1981), Uruguayan guitarist and composer •
Dirk Janssen (1881–1986), Dutch gymnast •
Dominique Janssen (born 1995), Dutch football defender •
Edward H. Janssen (1815–1877), German-born American politician; Treasurer of Wisconsin (1852–1856) •
Eilene Janssen (born 1938), American film and television actress •
Emmanuel Janssen (1879–1955), Belgian businessman who founded the Union Chimique Belge chemical company •
Ewert Janssen (died c. 1692), Danish architect •
Famke Janssen (born 1964), Dutch actress, director, screenwriter and fashion model •
Frances Janssen (1926–2008), American baseball pitcher •
Georges Janssen (1892–1941), Belgian lawyer, civil servant and governor of the National Bank of Belgium 1938–41 •
Gerard Janssen (born 1946), Dutch-born jeweller, watchmaker and politician in British Columbia •
Gheerart Janssen (fl. 1612–1623), sculptor working in Jacobean England, son of Gheerart Janssen the elder •
Gheerart Janssen the elder (died 1611), Dutch sculptor who operated a monument workshop in Elizabethan and Jacobean England •
Guus Janssen (born 1951), Dutch pianist and composer of contemporary music •
Henk Janssen (1890–1969), Dutch tug of war competitor •
Henry J. Janssen (1876–19??), American (Wisconsin) politician •
Herbert Janssen (1892–1965), German operatic baritone •
Horst Janssen (1929–1995), German draftsman, printmaker, poster artist and illustrator •
Horst-Janssen-Museum • (1937–2008), Dutch jazz drummer •
Inge Janssen (born 1989), Dutch rower • (born 1963), Dutch classical pianist •
Jan Janssen (born 1940), Dutch road bicycle racer, Tour de France winner 1968 •
Jan Janssen (gymnast) (1885–1953), Dutch Olympic gymnast •
Jan Janssen (ice hockey) (born 1952), American-Dutch ice hockey player •
Jann-Peter Janssen (1945–2022), German politician •
Jarno Janssen (born 2000), Dutch footballer • (1940–1986), French cameraman and documentary film maker •
Jeannette Janssen, Dutch-Canadian mathematician •
Johannes Janssen (1829–1891), German historian and priest •
John Janssen (1835–1913), German-born American Roman Catholic bishop in Illinois •
Jonathan Janssen (born 1995), New Zealand basketball player •
Jules Janssen (1824–1907), French astronomer (see Pierre Jansen) •
Julia Janssen (1900–1982), German stage and film actress •
Karl Janssen (1855–1927), German Baroque revival sculptor •
Kaylene Janssen (born 1968), Australian football midfielder •
Maarten Janssen (born 1962), Dutch economist •
Madison Janssen (born 1994), Australian cyclist •
Marco Janssen (born 1969), Dutch econometrist •
Mark Janssen (born 1992), Dutch football striker •
Martine Janssen (born 1977), Dutch breaststroke swimmer •
Miguel Janssen (born 1970), Dutch-Aruban sprinter •
Olaf Janßen (born 1966), German football midfielder and manager •
Patrick Janssen (born 1987), Canadian curler •
Paul Janssen (1926–2003), Belgian physician and founder of
Janssen Pharmaceutica •
Dr. Paul Janssen Award for Biomedical Research •
Paula Janssen (born 1996), Brazilian drummer for Quimere •
Peter Janssen (1844–1908), German historical painter •
Pierre Janssen (also Jules Janssen; 1824–1907), French astronomer, Named after him: •
Janssen (lunar crater) and
Janssen (Martian crater) •
Janssen Medal (French Academy of Sciences), an astrophysics award •
Janssen Peak, Antarctic mountain •
Janssen revolver, camera that originated chronophotography •
Ray Janssen (born 1937), American (Nebraska) politician •
René Janssen (born 1959), Dutch nanotechnologist •
Richard Janssen (born 1961), Dutch blues rock musician, leader of the band
Fatal Flowers •
Rik Janssen (born 1957), Dutch Socialist Party politician •
Roel Janssen (born 1990), Dutch football defender •
Roger Janssen (born 1977), Belgian darts player •
Ronald Janssen (born 1971), Belgian serial killer •
Ruud Janssen (born 1959), Dutch Fluxus and mail artist • (born 1971), Dutch chess player •
Simon Janssen (born 2000), Dutch footballer •
Sjoerd Janssen (born 1984), Dutch electronic dance musician, half of
Showtek •
Sjef Janssen (born 1950), Dutch equestrian and dressage coach •
Sjefke Janssen (1919–2014), Dutch road bicycle racer •
Stephen Janssen, 4th Baronet (died 1777), English Member of Parliament and Lord Mayor of London •
Stephen Vost Janssen (1879–1945), Australian violin and viola player •
Ted Janssen (1936–2017), Dutch physicist •
Theo Janssen (born 1981), Dutch football midfielder •
Theodore Janssen (c. 1658–1748), French-born English baronet and financier •
Tim Janssen (born 1986), Dutch football striker •
Tiny Janssen (born 1960s), Dutch sidecar cross rider •
Travis Janssen, American college baseball coach •
Vincent Janssen (born 1994), Dutch football striker •
Walter Janssen (1887–1976), German film actor •
Werner Janssen (1899–1990), American conductor, composer and film score composer •
Werner Janssen (philosopher) (born 1944), Dutch/German philosopher, Germanist, author and poet •
Willem Janssen (footballer, born 1880) (1880–1976), Dutch footballer •
Willem Janssen (footballer, born 1986), Dutch footballer •
Willy Janssen (born 1960), Dutch footballer •
Wouter Janssen (born 1982), Dutch electronic dance musician, half of
Showtek •
Zacharias Janssen (1585–before 1632), Dutch spectacle-maker, co-inventor of the telescope and the compound microscope == See also ==