Kline is a surname. Notable people with the surname include:
A. S. Kline (b. 1947), British authorAdam W. Kline (1818–1898), New York politicianBoštjan Kline (b. 1991), Slovenian alpine ski racerBranden Kline (b. 1991), American baseball playerCharles H. Kline (1870–1933), American politician, mayor of Pittsburgh, PennsylvaniaChristopher Paul Kline (b. 1979), American musician known as "Vertexguy" or "the Vertex Guy"Franz Kline (1910–1962), American artistJerry Kline (born 1951), American businessmanJohn Kline (Harlem Globetrotter) (fl. 1950s), American professional basketball playerJohn Kline (politician) (b. 1947), United States Representative from MinnesotaKevin Kline (b. 1947), American actorLindsay Kline (1934–2015), Australian cricketerMark Kline, American physicianMorris Kline (1908–1992), American professor of mathematics and writerOtis Adelbert Kline (1891–1946), American adventure novelistPaul Kline (1937–1999), British academic psychologistPhill Kline (born 1959), American lawyer and politician from KansasRichard Kline (b. 1944), American actor who played Larry on the sitcom Three's CompanyScott Richard Kline (1967-2015), given name of Scott Weiland, American singer and founding member of the alt-rock group Stone Temple PilotsStanley F. Kline (1901–1942), United States Navy sailor and Silver Star recipient