爱尔兰联合银行（Allied Irish Banks，缩写：AIB） 是爱尔兰的四大商业银行之一，2010年12月爱尔兰政府持有的爱尔兰联合银行股份已达99.8%，随着其国有化的步伐，爱尔兰联合银行也从伦敦证券交易所除牌，不过其仅剩的少部分股份仍在爱尔兰证券交易所上市发行。

AIB在英国的分行为“Allied Irish Bank (GB)”，在北爱尔兰为“First Trust Bank”，此外在美国等其他国家也有银行业务。2009年经济危机时与爱尔兰银行一起接受了政府35亿欧元的纾困款， 至2011年已增至133亿欧元。

Allied Irish Banks (AIB), A state owned bank, 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. It offers life assurance and pensions through its wholly owned subsidiary, Ark Life Assurance.