Lappalainen is a Finnish surname. Notable people with the surname include:
(born 1998), Finnish racing driver Kalle Lappalainen (1877–1965), Finnish sport shooter Konsta Lappalainen (born 2001), Finnish racing driver Lasse Lappalainen (born 1989), Finnish ice hockey player Martti Lappalainen (1902–1941), Finnish cross-country skier and biathlete Onni Lappalainen (1922–1971), Finnish gymnast Petri Lappalainen (born 1964), Finnish racing driver and founder of KIC Motorsport Tauno Lappalainen (1898–1973), Finnish cross-country skier Lassi Lappalainen (born 1998), Finnish footballer