Collen Brook Farm, also known as Collenbrook, is a historic house museum in Upper Darby Township, Pennsylvania, centered on an 18th-century farmhouse built in three sections on a Georgian plan. Its oldest part dates to about 1700, with later additions in 1774 and 1794, and the property also includes a spring house from about 1782 and a carriage house from about 1870. Long used as a rural homestead, it is associated with educator and political leader George Smith and later with Ludlow Ogden Smith, Katharine Hepburn’s first husband. Listed on the National Register of Historic Places in 1988, it is now operated as a local history museum.