Coleraine (Cúil Raithin in Irish) is a town in County Londonderry, Northern Ireland at the mouth of the river Bann. It has a marina, a theatre and a major campus of the University of Ulster (opened by Queen Elizabeth II in 1969). It is also the location of the 200ft Mountsandel mound, where wooden houses dating from about 7000 BC were uncovered.

It also has the headquarters of Coleraine Borough Council.

The Borough Council area together with the neighbouring district of Limavady, forms the East Londonderry constituency for elections to the Westminster Parliament and Northern Ireland Assembly.

Coleraine has been dubbed the 'Tourist captial of the Country' due to its popularity as a tourist destination. Well-known people from Coleraine include the actor James Nesbitt , and David Cunningham from the band The Flying Lizards, who produced the zeitgeist-defining hit single 'Money' in the early 1980's.

Coleraine also has its own radio station - Q97.2FM.

See also: County of Coleraine, List of towns in Northern Ireland