Klien is a surname. Notable people with the surname include:
*
Christian Klien
Christian Klien (born 7 February 1983) is an Austrian racing driver who competed in Formula One between and .
Born and raised in Hohenems, Klien competed in Formula One for Jaguar, Red Bull and HRT, scoring 14 championship points across 51 ...
(born 1983), Austrian racing driver
*
Erika Giovanna Klien (1900–1957), artist and art educator
*
Hermann Klien (born 1932), Austrian gymnast
*
Michael Klien (born 1973), choreographer and artist
*
Paula Klien, Brazilian artist
*
Walter Klien (1928–1991), Austrian pianist
{{surname