Hartley is a historic village in Northumberland, England. The village lies on the A193 road 4 miles (6 km) south of Blyth and 4 miles north of Tynemouth. It was a farming and later colliery village but today is part of Seaton Sluice. However it has given its name to the ward of Hartley which covers Seaton Sluice and New Hartley.