HARTLEY, a sea-port and township in the parish of EARSDON, eastern division of CASTLE ward, county of NORTHUMBERLAND, 5 miles (N.) from North Shields, containing 1795 inhabitants, who are chiefly employed in the collieries, fisheries, and salterns, and in the glass and copperas works established here. There are places of worship for Primitive and Wesleyan Methodists. A chapel, dedicated to St. Mary, and a hermitage, formerly stood on Bates island, opposite to the village of Hartley. The small harbour was made at the expense of Lord Delaval, to shelter fishing-boats in stormy weather. A woodcock was shot near this place in 1765, in the stomach of which was found a very valuable diamond. See SEATON-SLUICE.