Blackburnshire (also known as Blackburn Hundred) was a hundred, an ancient sub-division of the county of Lancashire, in northern England. Its chief town was Blackburn, in the northwest of the hundred. It covered an area similar to modern East Lancashire, including the current districts of Ribble Valley (excluding the part north of the River Ribble and east of the Hodder, which was then in Yorkshire), Pendle (excluding West Craven, also in Yorkshire), Burnley, Rossendale, Hyndburn, Blackburn with Darwen, and South Ribble (east from Walton-le-dale and Lostock Hall).