Here is a list of the 25 largest Southeast Asian banks ranked by total assets. The 5 largest banks include three Singaporean and two Malayan financial institutions.
| Rank | Bank | Country | Total Assets, US$b (December 31, 2018) |
| 1 | DBS Group Holdings | Singapore | 402.895 |
| 2 | Oversea-Chinese Banking Corp (OCBC) | Singapore | 342.027 |
| 3 | United Overseas Bank | Singapore | 283.820 |
| 4 | Maybank | Malaysia | 194.199 |
| 5 | CIMB | Malaysia | 128.526 |
| 6 | Public Bank Berhad | Malaysia | 100.997 |
| 7 | Siam Commercial Bank | Thailand | 97.490 |
| 8 | Kasikornbank | Thailand | 96.504 |
| 9 | Bangkok Bank | Thailand | 95.331 |
| 10 | Bank Rakyat Indonesia | Indonesia | 89.041 |
| 11 | Krung Thai Bank | Thailand | 83.933 |
| 12 | Bank Mandiri | Indonesia | 82.553 |
| 13 | Bank of Ayudhya (Krungsri) | Thailand | 66.484 |
| 14 | RHB Bank | Malaysia | 58.477 |
| 15 | BDO Unibank | Philippines | 57.323 |
| 16 | Bank Central Asia | Indonesia | 56.628 |
| 17 | Bank Negara Indonesia | Indonesia | 55.514 |
| 18 | BIDV | Vietnam | 54.665 |
| 19 | VietinBank | Vietnam | 50.179 |
| 20 | Hong Leong Bank | Malaysia | 48.825 |
| 21 | Vietcombank | Vietnam | 46.242 |
| 22 | Metropolitan Bank and Trust Company | Philippines | 42.552 |
| 23 | Bank of the Philippine Islands | Philippines | 39.551 |
| 24 | AmBank | Malaysia | 33.180 |
| 25 | Thanachart Bank | Thailand | 32.012 |
| 26 | TMB Bank | Thailand | 27.338 |