​ MIRFIELD, an urban district in the Morley parliamentary division of the West Riding of Yorkshire, England, 3 m. S.W. of Dewsbury, on the Lancashire & Yorkshire and London & North-Western railways. Pop. (1901), 11,341. The church of St Mary was completed in 1874, from designs of Sir Gilbert Scott. The tower of the ancient church remains. The large industrial population is employed in woollen, cotton, carpet and blanket manufactures, and in the numerous collieries in the vicinity.