The Joshua Twing Gristmill is a historic industrial facility at 450 North Main Street in the city of Barre, Vermont.

Built in 1844, it is a remarkably high-style example of Greek Revival architecture for an essentially utilitarian industrial structure.

Joshua Twing, its builder, was engaged for many years in a variety of industrial pursuits, primarily considered with engineering improvements in water wheels and turbines.

The interior of the stair tower includes trap doors to facilitate the movement of goods to the building's third level.

The interior of the building has a number of high-style Greek Revival features, including a double-spiral staircase and marbleized columns.