Kaarlo "Kalle" Kustaa Lappalainen (30 September 1877 – 9 May 1965) was a Finnish sport shooter who competed in the 1920 Summer Olympics.In 1920 he won the silver medal as member of the Finnish team in the team running deer, single shots event and the bronze medal in the team 300 metre military rifle, prone competition.
In the 1920 Summer Olympics he also participated in the following events:
Team free rifle - fourth place
Team 300 metre military rifle, standing - seventh place
Team 600 metre military rifle, prone - eighth place
Team 300 and 600 metre military rifle, prone - tenth place
300 metre free rifle, three positions - place unknown