Di Irlandia, istilah "empat besar" berlaku untuk empat bank terbesar menurut kapitalisasi pasar.[1][2] Ini semua beroperasi di Republik Irlandia dan Irlandia Utara, dan memiliki kehadiran internasional lebih luas.[3]
↑"Anglo Irish Bank Corporation (Executive Summary)". SME Financial. Diarsipkan dari asli tanggal 2011-05-04. Diakses tanggal 2012-01-17 "...The only banks with higher market capitalisation were Allied Irish Banks (AIB) and Bank of Ireland, both with strong retail and commercial presences. Ulster Bank and National Irish Bank are the other members of the ‘Big Four’ retail and commercial banks, both owned by overseas parents and not listed on the Irish Stock Exchange".;
