Adams Lake is an unincorporated community and census-designated place (CDP) in LaGrange County, Indiana, United States.

[2] The community is in southeastern LaGrange County, surrounding the natural water body of Adams Lake.

It is 2 miles (3 km) northeast of Wolcottville and 9 miles (14 km) southeast of LaGrange, the county seat.

[1] The lake drains at its south end into an unnamed creek which flows south to Little Elkhart Creek, a west-flowing tributary of the North Branch of the Elkhart River, part of the St. Joseph River watershed leading to Lake Michigan.

The United States Census Bureau delineated Adams Lake as a census designated place in the 2022 American Community Survey.