Duplantis is a French surname. Notable people with the surname include:
Armand Duplantis (born 1999), American-born Swedish pole vaulter Jesse Duplantis (born 1949), American Evangelical Charismatic Christian minister Johanna Duplantis (born 2002), American-born Swedish athlete (sister of Armand) Steve Duplantis (1972–2008), Canadian professional golf caddy