The DuPage County Historical Museum, formerly the Adams Memorial Library, is a building designed by Charles Sumner Frost in Wheaton, Illinois, United States.

Funds for its completions were donated by John Quincey Adams, a real estate investor and miller.

Charles Sumner Frost, who had recently designed the Chicago and North Western railroad station in Wheaton, was selected as the architect.

The endowment from Adams completely supported the facility until 1923, when Wheaton provided additional funds.

The museum seeks to "educate the general public through the collection, preservation, interpretation, and exhibition of materials which document the history of DuPage County and its relationship to Illinois and the nation, and to provide local history services for historical organizations and for scholarly endeavors.

It stands two stories tall and was built with coursed limestone and Bedford stone trimmings in the Richardsonian Romanesque style.

The style is characterized by rough-hewn stone blocks, emphasized horizontal lines, wide rounded arches, and intricate ornamentation.

The work is nearly identical to a library that Frost designed in Morgan Park, Chicago the previous year.