| Istanbul Hong | Central European Time | 02:00 |
| Istanbul Hong Kong | Hong Kong Time | -05:00 |
| Istanbul Hong Kong | Hong Kong Time | -05:00 |
| Istanbul Hong Kong | Hong Kong Time | -05:00 |
| Istanbul Hounslow | United Kingdom Time | 03:00 |
| Istanbul Hotchkiss | Mountain Time | 10:00 |
| Istanbul Hoylake | United Kingdom Time | 03:00 |
| Istanbul Howell | Eastern Time | 08:00 |
| Istanbul Howrah | India Standard Time | -02:30 |
| Istanbul Hoxie | Central Time | 09:00 |
| Istanbul Huanggang | China Time | -05:00 |
| Istanbul Huajuapan de León | Central Time | 09:00 |
| Istanbul Himmelkron | Central European Time | 02:00 |
| Istanbul Hima | East Africa Time | 00:00 |
| Istanbul Hillsborough | Eastern Time | 08:00 |
| Istanbul Hioki | Japan Time | -06:00 |
| Istanbul Hiram | Eastern Time | 08:00 |
| Istanbul Hingham | Eastern Time | 08:00 |
| Istanbul Hochdorf | Central European Time | 02:00 |
| Istanbul Hitzacker | Central European Time | 02:00 |
| Istanbul Homebush | Eastern Australia Time | -08:00 |
| Istanbul Hondarribia | Central European Time | 02:00 |
| Istanbul Homps | Central European Time | 02:00 |
| Istanbul Holywood | United Kingdom Time | 03:00 |
| Istanbul Holmes Beach | Eastern Time | 08:00 |
| Istanbul Holme's Hill | United Kingdom Time | 03:00 |
| Istanbul Hollywood | Eastern Time | 08:00 |
| Istanbul Holly Hill | Eastern Time | 08:00 |
| Istanbul Holly Hill | Eastern Time | 08:00 |
| Istanbul Hokes Bluff | Central Time | 09:00 |
| Istanbul Hokuto | Japan Time | -06:00 |
| Istanbul Holden Hill | Central Australia Time | -07:30 |
| Istanbul Holdenville | Central Time | 09:00 |
| Istanbul Holdorf | Central European Time | 02:00 |
| Istanbul Holdrege | Central Time | 09:00 |
| Istanbul Holesov | Central European Time | 02:00 |
| Istanbul Holgate | Eastern Australia Time | -08:00 |
| Istanbul Hogsback | South Africa Standard Time | 01:00 |
| Istanbul Hofheim | Central European Time | 02:00 |
| Istanbul Hoge Hexel | Central European Time | 02:00 |
| Istanbul Heubach | Central European Time | 02:00 |
| Istanbul Hethersett | United Kingdom Time | 03:00 |
| Istanbul Hewlett | Eastern Time | 08:00 |
| Istanbul Hexham | Eastern Australia Time | -08:00 |
| Istanbul Hexham | United Kingdom Time | 03:00 |
| Istanbul Heydon | United Kingdom Time | 03:00 |
| Istanbul Highgate | Western Australia Time | -05:00 |
| Istanbul High Falls | Eastern Time | 08:00 |
| Istanbul Higashiyama Ward | Japan Time | -06:00 |
| Istanbul Higashi Ward | Japan Time | -06:00 |