Duvillard Mill is a historic grist mill located at Cape Vincent in Jefferson County, New York. It was built in 1856 and is a 4+1⁄2-story, limestone structure with Stick style decoration. Originally a grist mill, it was later a shingle and planing mill. It has been remodeled for use as an aquarium and museum. It was listed on the National Register of Historic Places in 1985.