Clem is both a given name, often a short form (hypocorism) of Clement or other, similar names, a nickname and a surname. Notable people with the name include:

Given name or nickname

In sports

• Clement Clem Calnan (1888–1974), English cricketer
• Clement Clem Clemens (1886–1967), Major League Baseball catcher
• Clem Crowe (1904–1983), American college football and basketball player, college football and basketball head coach and professional football head coach
• Clem Curtis (1940–2017), Trinidadian-born British singer born Curtis Clements
• Clemon Clem Daniels (1937–2019), American college and professional football player
• Clemens Clem Dreisewerd (1916–2001), Major League Baseball pitcher
• Clem Eischen (1926–2020), American middle-distance runner
• Clem Goonan (born 1939), former Australian rules footballer
• Clem Haskins (born 1943), American college and National Basketball Association player and college basketball head coach
• Clemens Clem Hausmann (1919–1972), Major League Baseball pitcher
• Clement Clem Hill (1877–1945), Australian cricketer
• Clement Clem Kennedy (1921–2010), Australian rugby league player
• Clement Clem Labine (1926–2007), American Major League Baseball relief pitcher
• Clement Clem Loughlin (1894–1977), Canadian hockey player
• Charles Clem McCarthy (1882–1962), American sportscaster and public address announcer
• Clem Michael (born 1976), former Australian rules footballer
• Clement Clem Neacy (1898–1968), American National Football League player
• Clem Smith (footballer) (born 1996), Australian rules footballer
• Clement Clem Splatt (1899–1963), Australian rules footballer
• Clement Clem Stephenson (1890–1961), English footballer
• Clement Clem Stralka (1913–1994), American National Football League player
• Richard Clement Clem Thomas (1929–1996), Welsh rugby union footballer
• Clem Turner (1945–2009), American National Football League and Canadian Football League player
• Clement Clem Wilson (1875–1944), English cricketer

In politics and government

• Clement Attlee (1883–1967), British Prime Minister
• Clement Clem Balanoff (born 1953), American politician
• Clement Clem Campbell (born 1948), Australian politician
• Clement Clem S. Clarke (1897-1967), American oilman and politician
• Arthur Clarence Clem Hawke (1898–1989), General Secretary of the Australian Labor Party in South Australia, father of former Prime Minister Bob Hawke
• Clem Jones (1918–2007), Australian politician
• Clem McSpadden (1925–2008), American politician
• Clement V. Rogers (1839–1911), Cherokee senator and judge in Indian Territory
• Clement Clem L. Shaver (1867–?), American politician
• Clement Clem Simich (born 1939), New Zealand politician
• Clem Smith (politician), member of the Missouri House of Representatives since 2011

In arts and entertainment

• Clement Clem Beauchamp (1892–1992), American film actor, producer and director
• Clem Bevans (1879–1963), American character actor
• Clement Clem Burke (born 1955), American rock drummer
• Clemente Clem Cattini (born 1937), English drummer
• Clement Clem Christesen (1911–2003), Australian literary critic
• David Clem Clempson (born 1949), English rock guitarist
• Clement Clem De Rosa (1925–2011), American jazz drummer, composer, arranger, band leader and music educator
• Clem Schouwenaars (1932–1993), Belgian writer
• Clem Seecharan (21st century), Guyanese writer
• Clem Tholet (1948–2004), Rhodesian folk singer

In fiction

• Clem, a fictional character in Warframe
• Clem (Clémentine) Boissier, the main character of the TV series, played by Lucie Lucas
• Clem (Buffy the Vampire Slayer), a character in the television series Buffy the Vampire Slayer
• Clem Kadiddlehopper, a character played by comedian Red Skelton
• A character in the Firesign Theater's I Think We're All Bozos on This Bus album

Other

• Clement Bezold, American political scientist, futurologist
• Clem Coetzee (c. 1939-2006), Zimbabwean conservationist
• Steve "Clem" Grogan (born 1951), American convicted murderer and former member of The Manson Family
• Clements Clem Sohn (1910–1937), American airshow daredevil
• Clement Clem Tisdell (1939–2022), Australian economist

Surname

• Brian Clem (born 1972), American politician
• Chester Clem (born 1937), American politician
• George I. Clem (1910–1988), American politician
• Gordon Clem (1909–1970), Australian cricketer
• John Clem (1851–1937), United States Army general
• Mary Clem (1905–1979), American mathematician, and a human computer.
• Mitch Clem (born 1982), American cartoonist