Mixter Blacksmith Shop is a historic blacksmith shop located at Warrensburg, Warren County, New York. It was built about 1840 in the Greek Revival style to house a commercial operation and modified about 1890 in the Queen Anne style to accommodate mixed use activities. It is a two-story building built into a slope. It is constructed of load-bearing local granite and topped by a medium pitched roof clad in raised seam metal.

It was added to the National Register of Historic Places in 2002.