National forests in the United States are managed by the Department of Agriculture, specifically through the U.S. Forest Service.

The U.S. Forest Service is responsible for managing national forests and grasslands, overseeing sustainable forest management practices, recreation, wildlife habitats, and wildfire prevention. The Department of Agriculture's role is crucial in balancing the ecological health of these lands while providing resources like timber, recreation opportunities, and clean water. The Forest Service works to ensure that national forests are preserved for future generations while supporting economic activities.