Holywood Exchange is a major retail development on the borders of Belfast and Holywood, Northern Ireland. It is beside Belfast City Airport, in the townland of Knocknagoney. The site was previously known as D5 and Harbour Exchange. At present, the development compromises an eleven unit 13,940 m2 (150,000 ft2) retail warehouse centre with (as of December 2022); Harvey Norman, Lidl, Next Home, Decathlon and Wrights Sofaland.