Kline is a surname. Notable people with the surname include:
A. S. Kline (b. 1947), British author
Adam W. Kline (1818–1898), New York politician
Boštjan Kline (b. 1991), Slovenian alpine ski racer
Branden Kline (b. 1991), American baseball player
Charles H. Kline (1870–1933), American politician, mayor of Pittsburgh, Pennsylvania
Christopher Paul Kline (b. 1979), American musician known as "Vertexguy" or "the Vertex Guy"
Franz Kline (1910–1962), American artist
Jerry Kline (born 1951), American businessman
John Kline (Harlem Globetrotter) (fl. 1950s), American professional basketball player
John Kline (politician) (b. 1947), United States Representative from Minnesota
Kevin Kline (b. 1947), American actor
Lindsay Kline (1934–2015), Australian cricketer
Mark Kline, American physician
Morris Kline (1908–1992), American professor of mathematics and writer
Otis Adelbert Kline (1891–1946), American adventure novelist
Paul Kline (1937–1999), British academic psychologist
Phill Kline (born 1959), American lawyer and politician from Kansas
Richard Kline (b. 1944), American actor who played Larry on the sitcom Three's Company
Scott Richard Kline (1967-2015), given name of Scott Weiland, American singer and founding member of the alt-rock group Stone Temple Pilots
Stanley F. Kline (1901–1942), United States Navy sailor and Silver Star recipient
