a market-town of Ireland, in the county of Mayo, at the mouth of a small rivulet in Clew Bay, 10 miles S.W. of Castlebar and 170 W. by N. of Dublin. It is regularly and well built, and is one of the neatest towns in Ireland, having been much improved by the first Marquis of Sligo, who is the proprietor. The principal streets diverge from the Mall, an open space in the centre lined with large and handsome houses, and having at one end the entrance to Westport House, the seat of the Marquis of Sligo. Besides the parish church, there are here places of worship for Presbyterians, Methodists, and Roman Catholics. Westport has also a court-house, with a jail attached to it, a market-house, linen-hall, free school, dispensary, workhouse, and nunnery. Many of the inhabitants are employed in fishing, and in the manufacture of linen, beer, and brandy; and there is some trade in corn, flour, butter, pork, and whisky. Pop. (1851) 4815.