The Third Ellis Mill was an industrial mill located in Monson, Massachusetts. It was constructed in 1908 on the site of the old wooden Reynolds Mill. During its heyday, the two Ellis Mills made upholstery for a number of notable people, including Queen Elizabeth II of the United Kingdom's coronation car and the cars in the White House fleet. However, the company dissolved in 1962 and the building went through several more owners before finally closing in 2001.