Kauppi is a Finnish surname. Notable people with the surname include:
Emil Kauppi (1865–1930), Finnish composerKalle Kauppi (born 1992), Finnish footballerLo Kauppi (born 1970), Swedish film and theater actressMinna Kauppi (born 1982), Finnish orienteerOssi Kauppi (1929–2000), Finnish ice hockey playerPiia-Noora Kauppi (born 1975), Finnish politicianRaili Kauppi (1920–1995), Finnish philosopher