The 1999–2000 Irish League Cup (known as the Coca-Cola League Cup for sponsorship reasons) was the 14th edition of the Irish League Cup, Northern Ireland's secondary football knock-out cup competition. It concluded on 18 April 2000 with the final.
Linfield were the defending champions after their fifth League Cup win last season; a 2–1 victory over Glentoran in the previous final. This season they won a record third successive League Cup with a 4–0 victory over Coleraine in the final to lift the cup for the sixth time overall. The 4–0 scoreline remains the joint largest margin of victory in a League Cup final to date, with the record being equalled in 2013.[1][2]
Linfield's record of winning three consecutive League Cups was equalled by Cliftonville's three consecutive wins in 2012–13, 2013–14 and 2014–15. It was then broken when Cliftonville added a fourth consecutive win in 2015–16.