| Oulu Blackrock | Ireland Time | 02:00 |
| Oulu Björna | Central European Time | 01:00 |
| Oulu Black River Falls | Central Time | 08:00 |
| Oulu Blackburn | Eastern Australia Time | -07:00 |
| Oulu Blackfoot | Mountain Time | 09:00 |
| Oulu Blackheath | Eastern Australia Time | -07:00 |
| Oulu Bitan Aharon | Israel Time | 00:00 |
| Oulu Bithan | India Standard Time | -02:30 |
| Oulu Bithani Gaon | India Standard Time | -02:30 |
| Oulu Bissone | Central European Time | 01:00 |
| Oulu Bass Hill | Eastern Australia Time | -07:00 |
| Oulu Bastida | Central European Time | 01:00 |
| Oulu Bastrop | Central Time | 08:00 |
| Oulu Bathinda | India Standard Time | -02:30 |
| Oulu Bath | Eastern Time | 07:00 |
| Oulu Batang Tiga | Malaysia Time | -05:00 |
| Oulu Batam | Western Indonesia Time | -04:00 |
| Oulu Batu Caves | Malaysia Time | -05:00 |
| Oulu Batu Feringghi | Malaysia Time | -05:00 |
| Oulu Batu Maung | Malaysia Time | -05:00 |
| Oulu Bathurst | Atlantic Time | 06:00 |
| Oulu Bätterkinden | Central European Time | 01:00 |
| Oulu Battle | United Kingdom Time | 02:00 |
| Oulu Battery Point | Eastern Australia Time | -07:00 |
| Oulu Bauru | Brasilia Time | 06:00 |
| Oulu Baxter | Central Time | 08:00 |
| Oulu Bioggio | Central European Time | 01:00 |
| Oulu Biougra | Western European Time | 02:00 |
| Oulu Bir Ali Ben Khlifa | Central European Time | 02:00 |
| Oulu Birch Run | Eastern Time | 07:00 |
| Oulu Bir Tam Tam | Western European Time | 02:00 |
| Oulu Birkdale | Eastern Australia Time | -07:00 |
| Oulu Birkenau | Central European Time | 01:00 |
| Oulu Birkenfeld | Central European Time | 01:00 |
| Oulu Bisbee | Mountain Time | 10:00 |
| Oulu Birmingham | United Kingdom Time | 02:00 |
| Oulu Birmingham | United Kingdom Time | 02:00 |
| Oulu Biroda | India Standard Time | -02:30 |