Donegal or Donegal Town ("fort of the foreigners") is a town in County Donegal, Ireland. The name was historically written in English as Dunnagall or Dunagall. Although Donegal gave its name to the county, now Lifford is the county town. From the 1470s until the very early 17th century, Donegal was the 'capital' of Tyrconnell (Tir Chonaill), a Gaelic kingdom controlled by the O'Donnell dynasty of the Northern Ui Neill.

Donegal sits at the mouth of the River Eske and Donegal Bay, which is overshadowed by the Blue Stack Mountains ('the Croaghs'). The Drummenny Burn, which flows along the eastern edge of Donegal Town, flows into the River Eske on the north-eastern edge of the town, between the Community Hospital and The Northern Garage. The Ballybofey Road (the R267) crosses the Drummenny Burn near where it flows into the River Eske. The town is bypassed by the N15 and N56 roads. The centre of the town, known as The Diamond, is a hub for music, poetic and cultural gatherings in the area.

Donegal Castle was the stronghold of the O'Donnells. It has been restored by the Office of Public Works.

This Church of Ireland church was built in a simple Gothic style mainly in the late 1820s and was completed in 1828. The main church appears to have been designed by a Mr Graham of Donegal Town. A chancel was added in 1890. The chancel of 1890 was designed by the office of J. Guy Ferguson in Derry and built in a neo-Gothic style by James McClean builders from Strabane.