Langen or von Langen is a surname. Notable people with the surname include:
Birgit Collin-Langen (born 1956), German politician
Carl Freiherr von Langen (1887–1934), German horse rider who competed in the 1928 Summer Olympics
Christoph Langen (born 1962), German bobsledder
Dexter Langen (born 1980), German footballer
Ellen van Langen (born 1966), Dutch athlete
Eugen Langen (1833–1895), German entrepreneur, engineer and inventor, involved in the development of the petrol engine and the Wuppertal monorail
Ivar Langen (born 1942), rector at the University of Stavanger in Norway
Joseph Langen (1837–1901), German theologian
Odin Elsford Stanley Langen (1913–1976), U.S. Representative from Minnesota
Philipp Langen (born 1986), German footballer
Rudolph von Langen (1438 or 1439–1519), German Catholic divine, who helped introduced Humanistic ideas to the town of Munster
Werner Langen (born 1949), German politician and Member of the European Parliament
