Cousins is a surname. Notable people with the surname include:
- Alan William James Cousins (1903–2001), South African astronomer
- Ben Cousins (born 1978), former Australian rules footballer
- Christopher Cousins, American actor (born 1960)
- Dave Cousins , American archer
- Dave Cousins , leader of the UK band Strawbs
- David Cousins , British
- DeMarcus Cousins (born 1990), American basketball player
- Derryl Cousins , American baseball umpire
- Frank Cousins (British politician)
- Frank Cousins (American politician)
- Henry Cousins (1827–1888), American politician and lawyer
- Isaiah Cousins (born 1994), American basketball player in the Israeli Basketball Premier League
- Jake Cousins (born 1994), American baseball player
- James Cousins
- Jim Cousins, English politician
- Kirk Cousins (born 1988), American football player
- Kristina Cousins
- Lethia Cousins Fleming (1876–1963), American suffragist, teacher, civil rights activist and politician.
- L. S. Cousins
- Lothan Cousins, Jamaican politician
- Lucy Cousins, English author and illustrator
- Marshall Cousins (1869–1939), American politician, businessman, and historian
- Mark Cousins (footballer)
- Nick Cousins (born 1993), Canadian ice hockey player
- Norman Cousins (1915–1990), American writer and peace activist
- Dr. Oliver Cousins, fictional character
- Rae Cousins, American politician
- Richard Cousins (1959–2017), British businessman, chief executive of the Compass Group
- Robin Cousins (born 1957), British figure skater
- Samuel Cousins
- Scott Cousins (born 1985), American baseball player
- Steven Cousins, British figure skater
- Tina Cousins, English musical artist
- Tom Cousins, American sports businessman