There are four officially designated wilderness areas lying within Rio Grande National Forest that are part of the National Wilderness Preservation System.
All of them extend partially into neighboring National Forests, and one of these also onto National Park Service land (as indicated).

La Garita Wilderness (mostly in Gunnison NF)
Sangre de Cristo Wilderness (the largest part in San Isabel NF; also partly in Great Sand Dunes National Park and Preserve)
South San Juan Wilderness (partly in San Juan NF)
Weminuche Wilderness (mostly in San Juan NF)
There are four officially designated wilderness areas lying within Rio Grande National Forest that are part of the National Wilderness Preservation System. All of them extend partially into neighboring National Forests, and one of these also onto National Park Service land (as indicated).
La Garita Wilderness (mostly in Gunnison NF)
Sangre de Cristo Wilderness (the largest part in San Isabel NF; also partly in Great Sand Dunes National Park and Preserve)
South San Juan Wilderness (partly in San Juan NF)
Weminuche Wilderness (mostly in San Juan NF)
Rio Grande National Forest