Kampinos Forest (Polish: Puszcza Kampinoska) is a large forest complex located to the west of Warsaw in Poland. It covers a large part of the ancient valley of Vistula, between Vistula and Bzura rivers. Once a gigantic forest covering large part of central Poland, it currently covers roughly 240 km².

Most of the Kampinos forest is currently covered by Kampinos National Park (Kampinoski Park Narodowy). Among the distinctive features of the area is a combination of sandy dunes and marshes, with dense pine and spruce forest.