Allied Irish Banks (AIB) is a state owned bank and is one of the so-called "Big Four" commercial banks in Ireland. AIB offers a full range of personal and corporate banking services. AIB Capital Markets is the division of the company that offers international banking and treasury operations. The bank also offers a range of general insurance products such as home, travel, and health insurance.

AIB has a presence in Northern Ireland through its community-based full service bank First Trust Bank and in Britain where AIB GB serves its target audience of SMEs, owner-managed businesses and professional firms. EBS is also now part of the AIB Group and offers mortgage and deposit products and services from its own branch network.