Kauppi is a Finnish surname. Notable people with the surname include:
Emil Kauppi (1865–1930), Finnish composer
Kalle Kauppi (born 1992), Finnish footballer
Lo Kauppi (born 1970), Swedish film and theater actress
Minna Kauppi (born 1982), Finnish orienteer
Ossi Kauppi (1929–2000), Finnish ice hockey player
Piia-Noora Kauppi (born 1975), Finnish politician
Raili Kauppi (1920–1995), Finnish philosopher