 | Marina Hotel Istria | 2.0 star rating | 108 | Rabac |
| Marinela - One Bedroom Hotel Istria | Without Official Category | | Rabac |
 | Marinko - Two Bedroom Hotel Istria | Without Official Category | | Umag |
 | Marin - One Bedroom Hotel Istria | Without Official Category | | Pula |
 | Marin - Two Bedroom Hotel Istria | Without Official Category | | Pula |
 | Marin - Two Bedroom No.2 Hotel Istria | Without Official Category | | Pula |
 | Mario 1 - Six Bedroom Hotel Istria | Without Official Category | | Rabac |
 | Mario 1 - Three Bedroom Hotel Istria | Without Official Category | | Rabac |
| Mario - Two Bedroom Hotel Istria | Without Official Category | | Pula |
 | Mar - Three Bedroom Hotel Istria | Without Official Category | | Rabac |
 | Maslinica Hotels & Resorts - Camp Oliva Istria | 3.0 star rating | 210 | Rabac |
 | Maslinica Hotels & Resorts - Hedera Istria | 3.0 star rating | 245 | Rabac |
 | Maslinica Hotels & Resorts - Mimosa Istria | 4.0 star rating | 283 | Rabac |
 | Maslinica Hotels & Resorts - Narcis Istria | 4.0 star rating | 237 | Rabac |
 | Mauro 2 - One Bedroom Hotel Istria | Without Official Category | | Medulin |
 | Mauro 2 - One Bedroom No.2 Hotel Istria | Without Official Category | | Medulin |
 | Maya - Five Bedroom Hotel Istria | Without Official Category | | Pula |
 | Med 410 - Two Bedroom Hotel Istria | Without Official Category | | Medulin |
 | Mediteran Residence Hotel Istria | Residence | 110 | Rabac |
 | Melia Coral Hotel Istria | 5.0 star rating | 250 | Umag |
 | Melia Istrian Villas Hotel | 4.0 star rating | 180 | Umag |
 | Melia Istrian Villas - One Bedroom Hotel | Without Official Category | | Umag |
 | Melia Istrian Villas - One Bedroom No.2 Hotel | Without Official Category | | Umag |
 | Melia Istrian Villas - Two Bedroom Hotel | Without Official Category | | Umag |
| Mila Pula - One Bedroom Hotel Istria | Without Official Category | | Pula |
| Milka - One Bedroom Hotel Istria | Without Official Category | | Medulin |
| Milka - Two Bedroom No.2 Hotel Istria | Without Official Category | | Medulin |
| Mimosa Hotel Istria | 4.0 star rating | | Rabac |
| Mimosa Privatpension Hotel Istria | 3.0 star rating | 255 | Pula |
 | Miramar Hotel Istria | 3.0 star rating | 165 | Rabac |
 | Mira - One Bedroom Hotel Istria | Without Official Category | | Medulin |
 | Mira - Two Bedroom No.2 Hotel Istria | Without Official Category | | Umag |
 | Mira - Two Bedroom No.3 Hotel Istria | Without Official Category | | Umag |
 | Mirela - Three Bedroom Hotel Istria | Without Official Category | | Pula |
| Mobilhomes Valdaliso Hotel Istria | 3.0 star rating | | Rovinj |
 | Moira - Four Bedroom Hotel Istria | Without Official Category | | Umag |
 | Moj Mir & Bungalows Hotel Istria | 2.0 star rating | 107 | Umag |
 | Momiano - Two Bedroom Hotel Istria | Without Official Category | | Umag |
 | Monte Mulini Hotel Istria | 5.0 star rating | 109 | Rovinj |
 | Mutila - Six Bedroom Hotel Istria | Without Official Category | | Medulin |
 | Myosotis - Four Bedroom Hotel Istria | Without Official Category | | Rabac |
 | Nada - Five Bedroom Hotel Istria | Without Official Category | | Novigrad |
 | Nada - One Bedroom Hotel Istria | Without Official Category | | Pula |
 | Nada - One Bedroom No.2 Hotel Istria | Without Official Category | | Pula |
 | Nada - Two Bedroom Hotel Istria | Without Official Category | | Pula |
 | Nautica Hotel Istria | 4.0 star rating | 42 | Novigrad |
 | Neja - Five Bedroom Hotel Istria | Without Official Category | | Pula |
 | Nena - Three Bedroom Hotel Istria | Without Official Category | | Umag |
 | Nika - Five Bedroom Hotel Istria | Without Official Category | | Umag |
 | Nika - One Bedroom Hotel Istria | Without Official Category | | Umag |