1.
Oberbank, Linz, Austria
2.
OCBC Wing Hang Bank, Hong Kong, China
3.
Ocean Bank, Hai Duong, Vietnam
4.
Ocean Bankshares, Miami, United States
5.
Oceanic Bank, Abuja, Nigeria
6.
ODDO BHF, Paris, France
7.
OFG Bancorp, San Juan, Puerto Rico
8.
Old National Bancorp, Evansville, United States
9.
Oldenburgische Landesbank, Oldenburg, Germany
10.
Oman Arab Bank, Ruwi, Oman
11.
Omni Bank (California), Alhambra, United States
12.
One Bank Limited, Dhaka, Bangladesh
13.
Openbank, Madrid, Spain
14.
OP Financial Group, Helsinki, Finland
15.
OP-Pohjola Group, Helsinki, Finland
16.
Orienbank, Dushanbe, Tajikistan
17.
Orient Bank, Kampala, Uganda
18.
Orient Bank, Ho Chi Minh City, Vietnam
19.
Oriental Bank of Commerce, New Delhi, India
20.
Oriental Commercial Bank, Nairobi, Kenya
21.
Oromia International Bank, Addis Ababa, Ethiopia
22.
Ostsächsische Sparkasse Dresden, Dresden, Germany
23.
Otkritie Financial Corporation, Moscow, Russia
24.
Otkritie FC Bank, Moscow, Russia
25.
OTP Bank, Budapest, Hungary
26.
Oversea Chinese Banking Corporation (OCBC), Singapore, Singapore