Dromore is a small market town civil parish in the Banbridge District of County Down, Northern Ireland. It is south-west of Belfast, on the A1 Belfast – Dublin road. The 2001 Census recorded a population of 4,968 people.
The town's centre is Market Square, which has a rare set of stocks. It is in the linen manufacturing district. Dromore has the remains of a castle and earthworks, although these have modern buildings surrounding them, and a large motte and bailey or encampment (known locally as " the Mound "), and an earlier earthwork known as the Priest's Mount on the Maypole Hill.
The name Dromore—historically Drumore, Drummore and Drummor—is an anglicisation of the Irish Druim Mór (modern Irish Droim Mór) meaning "large ridge".
The town features a well preserved Norman motte and bailey that was constructed by John de Courcy in the early 13th century, shortly after the Norman invasion of Ireland. Known locally as 'the Mound', the fort occupies a prominent site to the east of the town centre and has views along the valley of the River Lagan. Dromore remained under Anglo-Norman control until it was captured and destroyed by Edward Bruce during the Irish-Bruce wars of 1315.
It was the seat of the diocese of Dromore, which grew out of an abbey of Canons Regular attributed to Saint Colman in the 6th century. This was united in 1842 to the Diocese of Down and Connor. The diocese was then divided in 1945, with the Diocese of Connor being independent, and the Diocese of Down and Dromore remaining united.
The town and cathedral were wholly destroyed during the rebellion of 1641, and the present church was built by Bishop Jeremy Taylor in 1661, who is buried there. Also buried in the cathedral is Thomas Percy, another famous bishop of the diocese, who laid out the fine grounds of the palace. A monument to Thomas Percy stands in the Town Park.
Jacobites under command of Richard Hamilton, and rival Williamites fought a battle here on the 14 March 1689. The battle took place about a mile out of the town on the Milebush Road and was known as the Break of Dromore. The Jacobites routed the Williamites and they fled in disorder, but with few casualties. After this Break of Dromore the Jacobites did not meet any resistance while advancing northwards and occupying Belfast.
Dromore had its own railway station from 1863 to 1956. The Banbridge, Lisburn and Belfast Junction Railway (BLB) through Dromore opened in 1863. Its line was a branch that joined the Ulster Railway main line Knockmore Junction, giving Dromore a direct link to and . In 1876 the Ulster Railway became part of the new Great Northern Railway, which took over the BLB company in 1877. In 1953 the railway was nationalised as the GNR Board, which closed the line through Dromore on 29 April 1956.