Swinford (Irish: Béal Átha na Muice, meaning 'ford-mouth of the pig') is a town in County Mayo, Ireland. It is surrounded by a number of smaller villages, including Midfield and Meelick. It is just off the N5 road, 18 km (11 mi) from Ireland West Airport. Situated on a tributary of the River Moy, Swinford is known for its fishing waters, including the Callow lakes and the lakes of Conn and Cullin. Swinford was bypassed in 1993 by the N5 route and was the first town in Mayo to be bypassed.

The origins of the name "Swinford" are disputed. Two primary theories exist; the first suggests that the original name of the town was "Swineford", derived from a pig market held regularly in the town. The official Irish language name for the town is "Béal Átha na Muice", which is "mouth of the ford of the pigs" in English. The second theory as to the origin of the Swinford name is that it has always been named Swinford, and that the name Swinford is derived from Swinford, Leicestershire. The Brabazon family, who founded the town, originally came to Ireland from Leicestershire in the 1700s.

Swinford was created as a planned town by the Anglo-Irish Brabazon family in the late 1700s. The Brabazons had originally resided in County Galway, but lost their estates there after fighting on the losing side in the Williamite War in Ireland. Although their Galway estates were confiscated, they were granted new land in County Mayo as a consolation. In 1769, the Brabazons began granting leases; 40 people were given the right to build houses in a pre-planned pattern and layout in the area that would become Swinford. The then landlord, William Brabazon, encouraged good quality structures by donating lumber and slate towards construction, and the result was that many of the initial structures in Swinford were three stories tall.

The Protestant church, which still stands today, was built in 1810, while a courthouse was constructed in 1840. Shortly thereafter in 1842 a workhouse was built, and it immediately became a focal point of the town as the Irish Famine began in 1846. In 1847, the death toll around Swinford was so severe that 564 corpses had to be buried in a mass grave behind the workhouse.

In 1855, the Sisters of Mercy established a presence in the town, building a convent near the parish church. They took over operations at the workhouse during the 1880s. In 1906 they established a primary school and a secondary school for girls in the town. In 1916 the Sisters of Mercy took over Brabazon estate house and converted it into a school.

During the 1890s a bridge was constructed in Swinford to allow the entry of a railway through the town as well as the establishment of Swinford railway station. It was also during the 1890s that a Catholic church was built.

John Dillon was a long-serving Member of Parliament for East Mayo at Westminster. His major policy issue was the resolution of the Land Question. Dillon took an uncompromising position in favour of the smallholders (small farmers) who sought to gain ownership of the land which they held as tenants from the largely Anglo-Irish landlords. From the middle of the 19th century, ongoing attempts were made at Westminster by the Liberal Party under William Ewart Gladstone to resolve the issue by passing the Irish Land Acts. Irish opinion, while welcoming of the initiative to resolve the injustice, was divided between the moderates, led by William O'Brien, who favoured a conciliatory approach (known as the doctrine of conciliation) and the hardliners. The hardliners supported an aggressive agrarian struggle and sought to advance simultaneously the struggle for Home Rule.

On 25 August 1903, Dillon, addressing a meeting of his constituents at the Swinford Workhouse, spoke vehemently against the doctrine of conciliation. This divided the Party and led to the departure of William O'Brien. It became known as the "Swinford Revolt". Despite the turmoil, the Chief Secretary for Ireland, George Wyndham's Land Purchase (Ireland) Act 1903 passed at Westminster, resolving the Irish Land Question.