Lake of the Woods is an unincorporated community in Marshall County, Indiana, United States. It was labeled a census-designated place (CDP) following the 2020 census.

The community is in northern Marshall County, built around the natural lake of the same name. It is 4 miles (6 km) southwest of Bremen, with which it shares a ZIP Code, and 9 miles (14 km) northeast of Plymouth, the county seat.

According to the U.S. Census Bureau, the Lake of the Woods CDP has a total area of 1.35 square miles (3.50 km), of which 0.69 square miles (1.79 km) are land and 0.66 square miles (1.71 km), or 48.78%, are water. The lake drains out of its south end into Isaac Sells Ditch, which flows southeast to the Yellow River, a west-flowing tributary of the Kankakee River and part of the Illinois River watershed.