Cookstown, town and former district (1973–2015) astride the former counties of Londonderry and Tyrone, now in Mid Ulster district, west of Lough (lake) Neagh, Northern Ireland. The town, a 17th-century Plantation of Ulster (English colonial) settlement, was named after its founder, Alan Cook.
The former district of Cookstown was bordered by the former districts of Magherafelt to the north, Omagh to the west, and Dungannon to the south. The outer limits of the Sperrin Mountains, constituting most of its northwestern portion, slope gradually eastward to the Ballinderry River valley and the flat shores of Lough Neagh. There is extensive dairy farming, and cattle, poultry, and pigs are raised. Fishing is another important industry in Cookstown; Ardboe, a southern parish, is famous for its trout. To the northeast of Cookstown is Springhill, a well-preserved Plantation of Ulster manor. Also nearby is the rath (ring fort) of Tullaghoge, which before its destruction in 1602 was the inauguration site for the chiefs of the O’Neill clan of Ulster. Area former district, 241 square miles (623 square km). Pop. (2001) town, 10,566; (2011) town, 11,620.