Kemppi is a Finnish surname. Notable people with the surname include:
Antti Kemppi (1893–1974), Finnish farmer and politician Hilkka Kemppi, Finnish politician Juliette Kemppi (born 1994), Finnish women's footballer Pekka Kemppi (1887–1957), Finnish politician Usko Kemppi (1907–1994), Finnish composer, lyricist, author and screenwriter