North Yolla Bolly Mountain, Mountain summit in Trinity County, California, US.

North Yolla Bolly Mountain is a 7,868-foot peak in the Klamath Mountains of Trinity County, Northern California, about 50 miles west of Red Bluff. A small glacial tarn, North Yolla Bolly Lake, sits in a cirque on its north slope. The mountain divides the headwaters of the South Fork Trinity River and Cottonwood Creek.

The Yolla Bolly-Middle Eel Wilderness, which contains North Yolla Bolly Mountain, was established in 1964 under the Wilderness Act. The peak lies in the Shasta-Trinity National Forest, about 50 miles west of Red Bluff. The mountain divides the headwaters of the South Fork Trinity River and Cottonwood Creek, and its Skylight Ridge spur touches the Middle Fork Eel River, forming the triple point of the Klamath, Sacramento and Eel river systems.

Yolla Bolly is a Wintu word meaning "snowy peak", a name shared with the surrounding peaks of the Coast Ranges crest that receive substantial annual snowfall. The Wintu people knew the region long before the mountain appeared on maps.

Access to the mountain comes by way of Forest Road 30, and the best climbing season runs from mid-June to early November when snow conditions permit safe passage. Visitors should be prepared for changing mountain weather and bring appropriate gear.

Skylight Ridge, a spur of North Yolla Bolly, touches the headwaters of the Middle Fork Eel River, making the mountain the triple point of the Klamath, Sacramento and Eel River systems, the three largest waterways of Northern California.