Noisy-Diobsud Wilderness, Nature reserve in Mount Baker-Snoqualmie National Forest, Washington, United States.

Noisy-Diobsud Wilderness is a 14,100-acre (57 km2) wilderness area in northwestern Washington, adjacent to North Cascades National Park and part of Mount Baker National Forest. It holds steep valleys, subalpine lakes, and the summits of Anderson Butte and Mount Watson. The only maintained trail enters the west side from the Anderson Lakes road above Baker Lake.

The Noisy-Diobsud Wilderness was designated in 1984, when it was placed under formal protection as part of the Mount Baker National Forest in northwestern Washington, next to North Cascades National Park. The protected area covers about 14,100 acres (57 km2).

The name joins Noisy Creek and Diobsud Creek, the two drainages that define the area. The only maintained trail enters the west side from the Anderson Lakes road above Baker Lake, so the creeks are what hikers follow into the valleys.

The area is accessed primarily through the Anderson and Watson Lakes Trail, which starts from Anderson Lakes Road above Baker Lake. Visitors should prepare for challenging terrain, wet conditions, and limited facilities within the protected area.

The area receives over 150 inches of annual rainfall, creating an exceptionally lush forest floor carpeted with mosses, ferns, elderberry, salal, salmonberry, and devil's club. This wet environment produces a distinctive ecosystem rarely found elsewhere in the region.