The rivière du Moulin is a tributary of the northwest shore of the Saint-Laurent river, descending in the municipality of Deschambault-Grondines, in the Portneuf Regional County Municipality, in the administrative region of Capitale-Nationale, in Quebec, in Canada.

[1] The surface of the Moulin river (except the rapids areas) is generally frozen from the beginning of December to the end of March; however, safe circulation on the ice is generally from late December to early March.

The water level of the river varies with the seasons and the precipitation; the spring flood occurs in March or April.

[2] In Description topographique... du Bas Canada..., published in 1815, the geographer Joseph Bouchette, wrote about the seigneury of Grondines, that it was very well watered by the Sainte-Anne river, the Batiscan, and a small river that falls in the St. Lawrence.

Still unnamed in 1815, this small river certainly received the name it now bears from the mill it once fed.