| Hinton Araç Kiralama | Leasing hizmetleri | | |
| Hippodrome Hotel | Otel | | 0212 517 45 29 |
| Hippo Tourism | Turizm acenteleri | | 0212 296 73 84 / 0535 046 83 56 / 0212 2 |
| Hira Hotel | Otel | | 0212 621 15 04 / 0536 438 01 50 |
| Hisar Filo | Şehiriçi yolcu taşımacılığı | | 0216 594 19 02 |
| Hisar Filo Kiralama | Leasing hizmetleri | | 0555 453 28 89 |
| Hisar Hotel | Otel | | 0555 178 02 35 |
| Hisar Tourism | Seyahat acenteleri | | 0216 444 59 60 |
| Hisar Tourism | Seyahat acenteleri | | 0216 444 59 60 |
| History Hotel | Otel | | 0212 520 66 07 / 0212 520 66 08 / 0212 5 |
| History Travel | Seyahat acenteleri | geziler | | 0536 560 10 38 / 0212 517 21 21 / 0532 5 |
| His Travel | Seyahat acenteleri | turizm acenteleri | | 0212 703 37 37 / 0212 703 37 77 / 0212 2 |
| Hitit Tour | Turizm acenteleri | | 0212 236 58 50 / 0541 236 58 50 |
| Hivaş Hotel | Otel | | 0212 512 52 68 / 0212 527 22 93 / 0533 3 |
| Hiv Motors | Otomobil satış galerileri | oto kiralama | | 0535 573 28 84 / 0212 570 41 90 |
| Hiwad otomotiv | Oto kiralama | | 0552 818 20 00 |
| Hizliotokiralama | Oto kiralama | | 0531 288 97 74 |
| Hizmet Turizm | Seyahat acenteleri | | |
| Hk Doğada Sağlık ve Turizm Tatil Köyü | Otel | | 0532 476 30 22 / 0530 832 16 00 / 0539 7 |
| Hnf Yatçılık | Tekne, kayık, yat | | 0212 251 83 59 |
| Hobyar Tour | Turizm acenteleri | oto kiralama | | 0531 292 12 53 / 0212 512 21 47 / 0506 3 |
| Hola Travel | Seyahat acenteleri | turizm danışma büroları | | 0212 225 69 36 / 0212 225 69 66 / 0537 3 |
| Holiday Business Suit Otel | Otel | | 0507 759 18 18 / 0212 572 13 72 |
| Holiday Inn İstanbul City | Otel | | 0212 530 99 00 / 0212 530 99 24 |
| Holiday Inn Istanbul Old City | Otel | | 0212 528 18 65 |
| Holiday Inn Istanbul Sisli | Otel | | 0212 373 38 00 |
| Holidayland Seyahat Acentası | Seyahat acenteleri | | 0531 552 89 43 / 0530 876 03 40 |
| Holiday Tour | Vize hizmetleri | turizm acenteleri | | 0212 213 34 29 / 0549 629 34 29 / 0534 2 |
| Holy Turizm | Geziler | | 0530 898 72 03 |
| Home Of Istanbul | Otel | | 0532 156 27 29 |
| Homesta Rent A Car | Oto kiralama | | 0507 539 16 99 |
| Home Stay Home Luxury Apart Hotels | Otel | | 0212 227 83 10 / 0212 230 90 43 |
| Hope Turizm | Geziler | | 0545 310 12 18 |
| Hoşgörütur | Seyahat acenteleri | | 0212 217 30 30 / 0212 217 30 35 / 0549 5 |
| Host Master Travel | Turizm acenteleri | geziler | pasaport ve vize işlemleri | | 0543 650 34 34 / 0212 221 05 73 / 0212 2 |
| Hôtel | Otel | | |
| Hotel 1453 | Otel | | |
| Hotel Adora | Otel | | 0212 527 49 49 / 0212 527 49 50 / 0212 5 |
| Hotel Akcinar | Otel | | 0212 513 32 73 / 0539 598 99 98 / 0212 5 |
| Hotel Aksaray | Otel | | 0212 512 05 19 / 0212 512 05 20 |
| Hotel Aldem | Otel | | 0212 512 40 79 / 0212 512 40 80 / 0212 5 |
| Hotel Amira | Otel | | 0212 516 16 40 / 0551 394 84 57 |
| Hotel Arcadia Blue | Otel | | 0212 516 96 96 / 0212 516 61 18 |
| Hotel Balo | Otel | | |
| Hotel Bazaar | Otel | | 0212 518 77 00 |
| Hotel Best İstanbul | Otel | | 0212 586 03 15 / 0552 598 15 22 |
| Hotel Beyaz Saray | Otel | | 0212 458 98 00 / 0212 458 98 30 |
| Hotel Beyce | Otel | | 0212 513 36 74 / 0545 766 63 41 / 0212 5 |
| Hotel Bosfora | Otel | | 0538 052 28 62 / 0212 236 30 35 / 0212 2 |
| Hotel Bosssuite Business | Otel | | 0216 519 03 03 / 0555 223 33 91 |