The Käsivarsi Wilderness Area (Finnish: Käsivarren erämaa-alue) is the second-largest wilderness reserve in Finland. It was established in 1991 like all the other 11 wilderness areas in Lapland. Its area is 2,206 square kilometres (852 sq mi). It is the most popular wilderness area in Finland, by number of visitors. It is governed by the Metsähallitus.
All Finnish fells of over 1,000 meters of height, except for nearby Saana, are situated in the Käsivarsi Wilderness Area.