Ulster Bank is a large commercial bank, and one of the traditional Big Four Irish banks. The bank was established in Belfast in 1836 and after 24 years of growth in Ulster, it expanded across the rest of Ireland in 1860.

Ulster Bank currently operates in both Northern Ireland and the Republic of Ireland. However, in 2021, its parent company NatWest announced that Ulster Bank would be closing down its Republic of Ireland business over the coming years.

Ulster Bank helps personal, small business, private and commercial customers with their banking needs, including mortgages provided by NatWest.