Milford Haven, town, Pembrokeshire, south-west Wales. It has a splendid landlocked harbour, with port facilities that were enlarged in the 1960s and 1970s to handle large cargoes of petroleum. The town is connected by pipeline to Manchester and has one of the largest oil refineries in Great Britain. Fishing also plays an important role in the town's economy. Originally a small hamlet, Milford Haven was laid out in 1790. In the 19th century a whaling industry flourished here. Population 13,194 (1991).