Enniscorthy (Irish: Inis Córthaidh) is the second-largest town in County Wexford, Ireland. The town is located on the picturesque River Slaney and in close proximity to the Blackstairs Mountains and Ireland's longest beach, Curracloe.

The Placenames Database of Ireland sheds no light on the origins of the town's name. It may refer either to the "Island of Corthaidh" or the "Island of Rocks". The cathedral of the Roman Catholic Diocese of Ferns is located in the town as well as an array of other historical sites such as Enniscorthy Castle and the key battle site of the 1798 Rebellion.

At the 2022 census, the population of the urban area of Enniscorthy was 12,310. The town is twinned with Gimont, France.

Enniscorthy Castle is an imposing Norman stronghold, which dates from 1205 and was a private dwelling until 1951. The castle was built by the DePrendergasts. In the early 1580s, the poet Edmund Spenser leased the property that included the castle.

The castle was also once owned by Sir Henry Wallop. The castle was the site of many fierce battles during the Cromwellian years and also during the 1798 Rising. The castle houses the Wexford County Museum, which contains extensive 1798 rebellion-related material, as well as items of local and agricultural interest. It was closed for major refurbishment from 2007 until May 2011.

Vinegar Hill (Cnoc Fhiodh na gCaor in Irish which translates as 'hill of the berry-tree'), a pudding-shaped hill overlooking the town, was the largest camp and headquarters of the rebels of 1798 who controlled County Wexford for thirty days against vastly superior forces, before their defeat on 21 June. However, many managed to flee south through a gap left in the British lines by General Needham (now known as Needham's Gap). During this time, Beauchamp Bagnell Harvey was declared President of the Wexford Republic.

The National 1798 Rebellion Centre is devoted to the history and aftermath of the 1798 Rebellion, setting it in its European context. It is housed in the former Congregation of Christian Brothers monastery. The Centre offers people the chance to see what famous figures were involved in the 1798 Rebellion.

Following the relaxation of the Penal Laws at the beginning of the 19th century, it became possible for the Roman Catholic community to consider building a cathedral to replace the one in Ferns that had been appropriated for use by the Church of Ireland during the English Reformation. Built in 1843, St. Aidan's Cathedral was designed by Augustus Welby Pugin, famous for having designed London's Houses of Parliament. The cathedral is in the same Neo-Gothic style. Notable features include the striking façade, a reredos carved from Caen stone and a great north window with intricate stone tracery. The cathedral was subsequently much renovated (in line with reforms promulgated by the Second Vatican Council). It was restored to its near original design in 1994 when authentic colours, materials and techniques were used. The restoration took a year, during which time cathedral services were held at St Mary's church (Church of Ireland) nearby.