DALTON-IN-FURNESS, urban district and market town of Lancashire, England, 4 m. N.E. of Barrow-in-Furness. Pop. (1931) 10,338. The church of St. Mary retains ancient fragments and a font believed to have belonged to Furness Abbey, which lies 3 m. S. of Dalton (see FURNESS). Of Dalton Castle, where the manorial court of Furness Abbey was held, there remains a square tower showing decorated windows. There are numerous iron-ore mines in the parish. A canal 31 m. long communicates with the sea.