Killybegs (Irish: Na Cealla Beaga) is a town in County Donegal, Ireland. It is the largest fishing port in the country and on the island of Ireland. It is located on the south coast of the county, north of Donegal Bay, near Donegal Town. Its Irish name Na Cealla Beaga means 'little cells', a reference to early monastic settlements. The town is situated at the head of a scenic harbour and at the base of a vast mountainous tract extending northward. In the summer, there is a street festival celebrating the fish catches and incorporating the traditional "Blessing of the Boats". As of 2022, the population was 1,258.