The capital of Northern Ireland is Belfast.
Belfast is the capital and largest city of Northern Ireland. It is located on the banks of the River Lagan and has a population of over 300,000 people. Belfast is an important economic centre for the region and is home to a number of important industries, such as shipbuilding, engineering, and finance. The city is also known for its vibrant culture and is home to a number of popular attractions, such as the Titanic Belfast museum, the Ulster Museum, and the Belfast Zoo.