Irish university business schools are not all recognized by the same international bodies. Some are accredited by the Association to Advance Collegiate Schools of Business (AACSB), while others are not. AACSB is the leading global accrediting body for business schools, and it is considered to be the gold standard for business education. However, there are other reputable accrediting bodies, such as the European Quality Improvement System (EQUIS) and the Association of MBAs (AMBA). Some Irish university business schools are accredited by EQUIS or AMBA, but not by AACSB.
In general, AACSB-accredited business schools are the most recognized internationally. However, there are also many non-AACSB-accredited business schools that offer excellent programs. It is important to do your research and choose a business school that is accredited by a reputable body and that has a strong reputation for academic excellence.