 | Ibis Istanbul Tuzla Hotel | 3.0 star rating | 200 | Asian Side |
 | Ibis Istanbul Zeytinburnu Hotel | 3.0 star rating | 228 | Ataturk Airport Istanbul |
 | Ibis Styles Taksim Hotel Istanbul | 4.0 star rating | 56 | New City |
 | Ibrahim Pasha Hotel Istanbul | 3.0 star rating | 19 | Old City |
 | Icon Hotel Istanbul | 4.0 star rating | 65 | New City |
 | Ikbal Deluxe Hotel Istanbul | 4.0 star rating | 163 | Old City |
 | Ilkay Hotel Istanbul | 3.0 star rating | 40 | Old City |
 | Inera Hotel Pendik Istanbul | 4.0 star rating | 30 | Asian Side |
| Inn City Boutique Nisantasi Hotel Istanbul | 3.0 star rating | | Ataturk Airport Istanbul |
| Innova Sultanahmet Hotel Istanbul | Superior 4* | 74 | Old City |
 | Innpera Hotel Istanbul | 4.0 star rating | 118 | New City |
 | Inntel Hotel Istanbul | Boutique | 36 | New City |
 | Inside Hotel Sisli Istanbul | 4.0 star rating | 117 | New City |
 | InterContinental Istanbul Hotel | 5.0 star rating | 390 | New City |
 | Interstellar Hotel Istanbul | 4.0 star rating | 66 | Ataturk Airport Istanbul |
 | Ipek Palas Hotel Istanbul | 4.0 star rating | 81 | Old City |
| IQ Houses Apartments Kurabiye Hotel Istanbul | Aparthotel 3* | 13 | New City |
| IQ Houses Mis Hotel Istanbul | Aparthotel 3* | 9 | New City |
 | ISG Airport Hotel Istanbul | 4.0 star rating | 128 | Asian Side |
| Ishakpasa Konagi Hotel Istanbul | 3.0 star rating | | Old City |
| istanbul Apex Hotel Istanbul | Boutique | 20 | Old City |
 | Istanbul Assos Hotel | 4.0 star rating | 51 | Old City |
 | Istanbul Central Hotel | 2.0 star rating | 15 | Old City |
 | Istanbul Comfort Hotel Old City | Standard | 12 | Ataturk Airport Istanbul |
| Istanbul Dedem Hotel | 3.0 star rating | 32 | Ataturk Airport Istanbul |
 | Istanbul Dora Hotel | 4.0 star rating | 119 | New City |
| Istanbul Family Apartments Hotel | Aparthotel 3* | 15 | Old City |
 | Istanbul Golden city Hotel | 4.0 star rating | 62 | New City |
 | Istanbul Gonen Hotel | 5.0 star rating | 305 | Ataturk Airport Istanbul |
 | Istanbul Holiday Hotel | Boutique | 27 | Old City |
 | Istanbul Inn Hotel | Pending Category | 25 | New City |
 | Istanbul Marriot Hotel Asia | 5.0 star rating | 238 | Asian Side |
 | Istanbul Marriott Hotel Sisli | 5.0 star rating | 259 | New City |
 | Istanbul Matiat Hotel | 4.0 star rating | 55 | Old City |
 | Istanbul Modern Residence Hotel | 3.0 star rating | 22 | New City |
 | Istanbul Town Hotel | 3.0 star rating | 35 | Old City |
 | Istanbul Trend Hotel | 4.0 star rating | 55 | Old City |
 | Istanburg Efes Hotel Istanbul | Boutique | 22 | New City |
 | I'zaz Lofts Hotel Istanbul | Without Official Category | 4 | New City |
 | Jazz Hotel Nisantasi Istanbul | 3.0 star rating | 12 | New City |
| Just Inn Hotel Istanbul | Boutique | 23 | Old City |
 | Kadikoy As Albion Hotel Istanbul | 3.0 star rating | 35 | Asian Side |
| Kadikoy Park Suites Hotel Istanbul | 5.0 star rating | 15 | Asian Side |
 | Kadirga Antik Hotel Istanbul | 3.0 star rating | 27 | Old City |
 | Kafkas Hotel Istanbul | 3.0 star rating | 36 | Old City |
 | Kaftan Hotel Istanbul | 3.0 star rating | 18 | Old City |
 | Karakoy Aparts Hotel Istanbul | Aparthotel 4* | 19 | New City |
 | Karakoy Port Hotel Istanbul | 3.0 star rating | 22 | New City |
 | KARAKOY ROOMS Hotel Istanbul | Boutique | 12 | Beyoglu |
| Kars Otel Hotel Istanbul | Without Official Category | | Ataturk Airport Istanbul |