Jennings is a surname of early medieval English origin (also the Anglicised version of the Irish surnames Mac Sheóinín or MacJonin). Notable people with the surname include:

• Jennings (Swedish noble family)

A–G

• Adam Jennings (born 1982), American football player
• Al Jennings (1863–1961), American attorney in Oklahoma Territory, train robber and silent film star
• Alex Jennings (born 1957), British actor
• Andrew Jennings (1943–2022), British investigative journalist
• Anfernee Jennings (born 1997), American football player
• Asa Jennings (1877–1933), American who commanded the evacuation of refugees after the Great Fire of Smyrna
• Bernard Jennings (1929–2017), British local historian and adult educationist
• Billy Jennings (born 1952), English footballer
• Billy Jennings (Welsh footballer) (1893–1968), Welsh footballer
• Brandon Jennings (born 1989), American basketball player
• Brent Jennings (born 1951), American actor
• Brian Jennings, American football player
• Bryant Jennings, American boxer
• Cal Jennings, American soccer player
• Charles Edward Jennings (1751–1799), Irish-born French general
• Charles Jennings (journalist) (1908–1973), Canadian journalist
• Christine Jennings (born 1945), American politician
• Claudia Jennings (1949–1979), American model and actress
• Clyde Jennings (1916–2006), Florida philatelist
• Desmond Jennings (born 1986), American baseball player
• Desmond Domnique Jennings (1971–1999), American serial killer
• Edward Jennings (VC) (1820–1889), Irish recipient of the Victoria Cross
• Edward H. Jennings (1937–2019), tenth president of Ohio State University
• Ed Jennings (born 1968), Florida politician
• Edward Jennings (rowing) (1898–1975), American coxswain
• Elizabeth Jennings (1926–2001), English poet
• Elizabeth Jennings Graham (1830–1901), American black civil rights activist and teacher
• Ernie Jennings (born 1949), American football player
• Francis Jennings, American historian
• Garth Jennings (born 1972), English film director, screenwriter, producer, actor and writer
• Gary Jennings (1928–1999), American author
• Gary Jennings Jr. (born 1997), American football player
• Gavin Jennings (born 1957), Victorian Politician
• George Jennings (1810–1882), pioneering British sanitary engineer
• Gerald H. Jennings, ichthyologist and author
• Grant Jennings, (born 1965), Canadian ice hockey player
• Greg Jennings, American football player

H–L

• Henry Jennings, British privateer
• Henry Constantine Jennings, English antiquarian
• Herbert Spencer Jennings, zoologist, geneticist and eugenicist
• Hilde Jennings (1906–?), German actress
• Hughie Jennings, American baseball player
• Humphrey Jennings (1907–1950), English filmmaker
• Ivor Jennings (1903–1965), British lawyer
• J. B. Jennings, American politician
• Jack Jennings (1919–2024), British World War II veteran
• James Jennings (disambiguation), several people
• Jauan Jennings (born 1997), American football player
• Jazz Jennings, American transgender activist
• Jeremy Jennings, English political theorist
• Jesse D. Jennings (1909–1997), American archaeologist
• Joanne Jennings (born 1969), British high jumper
• John Jennings (disambiguation), several people
• Jonas Jennings, American football player
• Jonathan Jennings, first governor of Indiana
• J. T. W. Jennings, 20th century architect
• Kate Jennings (1948–2021), Australian writer
• Keaton Jennings, English cricketer
• Keith Jennings (American football) (born 1966), American football player
• Keith Jennings (basketball) (born 1968), American basketball player and coach
• Keith R. Jennings (born 1932), English chemist
• Keith Jennings (cricketer) (born 1953), English cricketer
• Ken Jennings, American game show host and prior to hosting it, was the first Jeopardy! superchampion
• Kenneth Jennings (disambiguation), several people
• La Vinia Delois Jennings, American literary scholar
• Leonard Jennings, English cricketer and Royal Air Force officer
• Luke Jennings, British author of the novel Codename Villanelle
• Lyfe Jennings, American musician
• Lynn Jennings, American distance runner

M–Z

• M. D. Jennings, American football player
• Marlene Jennings, Canadian politician
• Mason Jennings, American musician
• Maureen Jennings (born 1939), British Canadian writer
• Maxine Jennings (1909–1991), American actress
• Michael Jennings (disambiguation), several people
• Morley Jennings (1890–1985), American college sports coach
• Newell Jennings (1883–1965), Associate Justice of the Connecticut Supreme Court
• Nicky Jennings (1946–2016), English footballer
• Nick Jennings (computer scientist) (born 1966), English Regius Professor of computer science
• Nicolette Jennings (born 1996), American model, beauty pageant titleholder (Miss Florida USA 2019 and Top 10 finalist Miss USA 2019)
• Owen Jennings, New Zealand politician
• Pat Jennings, Northern Irish footballer
• Patrick Jennings (1831–1897), Australian politician
• Paul Jennings (Australian author) (born 1943), Australian children's author
• Paul Jennings (British author) (1918–1989), English humorist
• Paul Jennings (slave) (1799–1874), American slave owned by President James Madison
• Peter Jennings (1938–2005), ABC News anchor and newsman
• Peter Jennings (serjeant-at-arms) (born 1934), British public servant
• Peter R. Jennings (born 1950), Canadian scientist and entrepreneur
• Philip Jennings (The Americans), fictional character in the 2010s American television drama series The Americans
• Philip Jennings (Queenborough MP) (c1679–1740), English lawyer and politician, MP for Queenborough 1715–22
• Sir Philip Jennings-Clerke, 1st Baronet (c1722–January 1788), known as Philip Jennings until the 1760s, MP for Totnes 1768–88
• Renz L. Jennings (1899–1983), Associate Justice of the Arizona Supreme Court
• Richard E. Jennings (1927–1991), British comic book artist
• Richard Jennings (c1619–1668), British politician
• Rick Jennings (born 1953), American football player
• Robert Yewdall Jennings (1913–2004), English jurist
• Sarah Jennings (1660–1744), 1st Duchess of Marlborough
• Shooter Jennings (born 1979), American musician
• Stanford Jennings, American football player
• Steve Jennings (footballer) (born 1984), English footballer
• Stephen Arthur Jennings, Canadian mathematician
• Talbot Jennings (1894–1985), American playwright and screenwriter
• Ted Jennings (born 1990), American football player
• Theodore Jennings (1942–2020), American author
• Tim Jennings (born 1983), American football player
• Tom Jennings (born 1955), creator of FidoNet
• Toni Jennings (born 1949), American politician
• Waylon Jennings (1937–2002), American country music singer
• Will Jennings (born 1944), American songwriter
• William Dale Jennings, American author
• William M. Jennings (1920–1981), American businessman and hockey team owner
• William Nicholson Jennings (1860–1946), American photographer
• W. Pat Jennings (1919–1994), U.S. Representative from Virginia
• William Sherman Jennings (1863–1920), governor of Florida