Lassen

 ( Danish-language Surnames ) 

Lassen is a Danish language and Norwegian patronymic surname meaning "son of Lars" (equivalent of Laurentius), and thus a parallel form of the more common surname Larsen. Notable people with the surname include:

• Anders Lassen (1920–1945), Danish recipient of the British Victoria Cross
• Christian Lassen, Norwegian-German orientalist
• Clyde Everett Lassen, United States Navy aviator and Medal of Honor recipient
• Eduard Lassen, Belgian composer
• Erik Sætter-Lassen (1892–1966), Danish sport shooter
• Frederik Lassen, Danish football player
• Georg Lassen, German U-boat captain
• Hans Christian Lassen, Danish sprint canoer
• Hartvig Lassen (1824–1897), Norwegian editor and literary historian
• Henrik Andreas Zetlitz Lassen, Norwegian politician
• Inger Lassen (1911–1957), Danish actress
• Jean Elisabeth Lassen, Canadian weightlifter
• Justin Lassen, American composer, producer, multi-instrumentalist and remixer
• Leigh Lassen, American actress
• Leo Lassen (1899–1975), American baseball announcer
• Niels A. Lassen (1926–1997), Danish medical researcher
• Peter Lassen, Danish-American rancher, prospector and explorer
• Peter Lassen (footballer), Danish football player
• Werner Lassen, Namibian golfer

Lassen may also refer to Lassen Peak, located in Lassen Volcanic National Park, a national park in the United States.

• Larsen (disambiguation)
• Larson (disambiguation)