The William and Helen Coffeen House is a historic house located at 306 S. Garfield Street in Hinsdale, Illinois. Built in 1899–1900, the house is an early example of architect George W. Maher's Prairie School work. The house has a stucco exterior, a building material that ultimately became a distinctive element of Maher's work. The decorative wooden frame around the house's entrance and the extensive use of stained glass windows highlight how Maher developed a distinctive personal style of ornamentation in his designs. The house's original owners were real estate agent William Coffeen and his wife Helen, both of whom were active members of Hinsdale's civic and social life.