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: