Lac Dauphinais is a backcountry canoe-camping lake located within La Mauricie National Park in Quebec, Canada. It sits in the park's east sector and is classified as part of the difficult routes requiring portages, making it suitable for paddlers with experience in multi-lake wilderness travel.

Access to Dauphinais Lake is via the Lac-Soumire parking lot. The route from this departure point involves a series of portages and lake crossings: a 0.5 km moderate portage (approximately 15 minutes) leads to Soumire Lake, followed by 1.4 km of paddling (20 minutes), then another 0.5 km moderate portage (15 minutes) to Giron Lake, 1.8 km of paddling (25 minutes), and finally a 1 km difficult portage (30 minutes) before reaching the Dubon-Dauphinais Lake area, which involves 5.4 km of paddling (approximately 1 hour 20 minutes). The lake is also referenced in a longer circuit connecting to Lac des Cinq and other park lakes.

Dauphinais Lake offers two designated campsites, both without fire pits. Fires are not permitted at this lake, so paddlers must plan accordingly and bring appropriate cooking equipment. Each campsite provides access to a dry toilet and a bear-proof food hanger. Campsites at Dauphinais Lake do not include picnic tables.

Paddlers using the Saint-Gérard entrance are required to register at either the Saint-Mathieu or Saint-Jean-des-Piles Visitor Reception Centre before proceeding to their campsite. During the summer season, the maximum departure time to reach Dauphinais Lake is 2 pm, reduced to 1 pm after Labour Day — a strict schedule that paddlers must observe when planning their trip.

Row-and-go canoes are available for rent within the park, which allows paddlers to access backcountry lakes without portaging. Those renting canoes must pick up a token at the on-site boat and equipment rental at the Shewenegan Picnic Area. Kayak-camping and paddleboard-camping are noted as options for more experienced paddlers.

The lake is part of a network of over 150 lakes within La Mauricie National Park, a protected area managed by Parks Canada. The park's canoe-camping network connects numerous backcountry lakes through a system of portages and waterways, and Dauphinais Lake represents one of the more remote and demanding destinations within that system.