The Ballymena, Ballymoney, Coleraine and Portrush Junction Railway was an Irish gauge (1,600 mm/5 ft 3 in) in County Antrim, Northern Ireland.
The railway was established under the chairmanship of the Rt Hon Hugh Seymour, with an authorised capital of £200,000 (equivalent to £16,855,685 in 2015).
The line was constructed by William Dargan and opened on 4 December 1855, from Ballymena to Coleraine and Portrush.
In January 1861, it was taken over by the Northern Counties Committee.