Revenue stamps of Northern Ireland refer to the various revenue or fiscal stamps, whether adhesive, directly embossed or otherwise, which were issued by and used in Northern Ireland, a constituent country of the United Kingdom. From 1774, various revenue stamps of Ireland were used throughout both Northern and Southern Ireland, while revenue stamps of the United Kingdom were also used to pay for some taxes and fees.
Upon the partition of Ireland in 1921, separate revenue stamps began to be issued for both Northern Ireland and Southern Ireland. The latter were withdrawn soon afterwards upon the establishment of the Provisional Government, but the former continued to issue revenue stamps until the late 20th century. The need for separate issues for Northern Ireland came about since taxes raised there were meant to remain in the country. Most Northern Irish revenue stamps were British key types with appropriate inscriptions, but there were a number of different issues as well.