The Nashwaak River is a 113-kilometre tributary of the Saint John River flowing through west-central New Brunswick, Canada. Rising from Nashwaak Lake southeast of the village of Juniper, the river drains southward before turning east through the village of Stanley and the community of Nashwaak, then continues southeast through Nashwaak Bridge and south through rural communities including Taymouth, Durham Bridge, Nashwaak Village, and Penniac, ultimately entering Fredericton through Marysville before spilling into the Saint John River. Draining a watershed of roughly 1,706 km², the Nashwaak is one of the most popular fishing destinations in the Fredericton Capital Region, offering a diverse mix of species in a scenic, accessible setting. The river's name derives from the Wolastoqey language, with translations including "slow current," "halfway-place," and "strong undercurrent" — all of which hint at the varied water character anglers will encounter along its length.