| Goldenvan Travel | Seyahat acenteleri | turizm acenteleri | geziler | | 0537 504 65 04 |
| Gold Oto Kiralama | Oto kiralama | | 0216 540 34 54 / 0530 784 60 45 |
| Gold Point Car Rental | Oto kiralama | | 0532 431 49 46 |
| Goldstar Turizm | Otobüs taşımacılığı | otobüs biletleri | | 0545 946 24 47 / 0212 529 12 53 / 0212 5 |
| Gold Suit | Otel | | 0552 564 24 24 |
| Golva Rooms | Otel | | 0507 817 50 70 |
| Gölve Sitesi | Otel | | |
| Gonca Taksi | Taksi | | 0212 213 64 44 |
| Gönül Turizm | Seyahat acenteleri | | 0212 466 01 15 / 0212 466 01 17 |
| Go Safe Tour | Seyahat acenteleri | | 0554 146 62 61 |
| GoTurkeyTours | Seyahat acenteleri | uçak ve demiryolu biletleri | | 0532 421 61 64 |
| Gözal Turizm | Seyahat acenteleri | | |
| Gözde Tekne | Tekne, kayık, yat | tersaneler | | 0532 497 59 34 |
| Gozz Rent A Car | Oto kiralama | | 0533 688 30 40 / 0212 225 46 99 |
| Grace Way Travel Agency 恩途（国际）旅行社 | Seyahat acenteleri | | 0506 497 20 26 |
| Grafik Travel | Seyahat acenteleri | | 0212 255 05 66 |
| Granada Luxury Hotels | Otel | | |
| Grand Aksu Otel | Otel | | 0212 530 99 47 / 0212 584 31 37 / 0212 6 |
| Grand Anka Hotel | Otel | | 0212 635 20 20 / 0212 534 18 55 |
| Grand Ant Hotel | Otel | | 0212 529 15 00 |
| Grand Aras Hotel & Suites | Otel | | 0212 373 67 67 |
| Grand Cevahir Otel | Otel | | 0212 314 42 42 / 0212 314 44 44 |
| Grand Dedem Hotel | Otel | | 0534 564 02 88 |
| Grand Durmaz Hotel | Otel | | 0212 512 47 47 / 0212 526 19 19 |
| Grand Hisar Hotel | Otel | | 0212 292 80 51 / 0212 292 80 52 / 0212 2 |
| Grand Hotel de Londres | Otel | | 0212 293 16 19 / 0212 245 06 70 / 0212 2 |
| Grand Hyatt Istanbul | Otel | | 0212 368 12 34 / 0212 368 10 00 |
| Grand Madrid Hotel | Otel | | 0212 638 04 24 / 0212 751 89 60 / 0212 5 |
| Grand Moon Hotel | Otel | | 0537 789 44 36 |
| Grand Naki Hotel | Otel | | 0212 638 81 88 / 0212 638 81 90 / 0212 6 |
| Grand Oral Otel | Otel | | 0212 516 57 76 / 0212 516 92 31 / 0212 5 |
| Grandoria Turizm | Seyahat acenteleri | | 0212 296 30 10 / 0212 296 30 30 / 0530 5 |
| Grand Reis Otel | Otel | | 0212 631 20 03 / 0212 631 20 04 / 0212 6 |
| Grand Rent A Car | Şehiriçi yolcu taşımacılığı | oto kiralama | | 0216 330 50 05 / 0532 396 83 75 / 0216 3 |
| Grand Rosa Hotel | Otel | | 0212 516 11 92 / 0542 105 55 95 |
| Grand Sağcanlar Hotel | Otel | | 0212 517 40 64 / 0212 517 40 78 |
| Grand Sirkeci Otel | Otel | | 0212 945 06 14 |
| Grand Star Hotel Bosphorus | Otel | | 0212 252 70 70 / 0549 719 06 50 |
| Grand Ünal Otel | Otel | | 0546 526 02 02 / 0212 516 84 87 |
| Grand Vatan Hotel | Otel | | 0212 533 89 71 / 0212 533 90 83 / 0212 5 |
| Grand VIP Suite | Otel | | 0532 100 26 49 / 0216 414 70 40 |
| Grand Washington Hotel | Otel | | 0212 511 63 71 / 0212 512 47 48 |
| Gravite | Seyahat acenteleri | turizm acenteleri | | 0538 048 89 47 / 0537 525 75 51 |
| Grd İnci Palas | Otel | | |
| Great Fortune Design Hotel & SPA | Otel | | 0212 823 30 46 / 0542 568 75 51 / 0212 5 |
| Green Anka Otel | Otel | | 0212 525 37 78 / 0212 631 17 22 / 0212 6 |
| Green Car Vıp Araç Kiralama | Oto kiralama | | 0532 642 13 74 |
| Greenland Turizm | Seyahat acenteleri | | 0535 446 39 24 |
| Green Motion | Oto kiralama | | |
| Green Motion Car Rental | Oto kiralama | şehiriçi yolcu taşımacılığı | | 0216 606 21 71 |