Presby Memorial Iris Gardens is a nonprofit, volunteer-run living museum specializing in iris flowers, located at 474 Upper Mountain Avenue, Montclair in Essex County, New Jersey, New Jersey, United States. The gardens are situated on 6.5 acres. Adjacent to the gardens is a Victorian house, the Walther House. The house is open to the public and is home to a museum shop and headquarters for the Citizens Committee that oversees the gardens.