Natchaug State Forest is a Connecticut state forest located in six towns including Ashford, Chaplin, and Eastford.

[3] The Natchaug River runs from north to south along (and in a few cases through) the western border of the main forest parcel.

One of the forest units abuts Mashamoquet Brook State Park in Pomfret.

[3] Trails are used for hiking, horseback riding, mountain biking, cross-country skiing, and snowmobiling.

[5] The forest is also the site of a small state park encompassing the birthplace of American Civil War brigadier general Nathaniel Lyon.