Jennison is a surname. Notable people with the surname include:
Abraham Jennison (born 1804), a convict transported to Western AustraliaCharles R. Jennison (1834–1884), hero of the anti-slavery faction during the Bleeding Kansas Affair and Union colonel during the American Civil WarJennison Heaton (1904–1971), American bobsled and skeleton racer who competed in the late 1920sJennison Myrie-Williams (born 1988), English footballer who plays as a wingerMartin Jennison, former association football player who represented New Zealand at international levelMelissa Jennison (born 1982), athlete from AustraliaRay Jennison, player in the National Football LeagueRoger Clifton Jennison (1922–2006), radio astronomer at Jodrell Bank under the guidance of Robert Hanbury BrownSilas H. Jennison (1791–1849), American Whig politician