Eski Mosque or Old Mosque (Turkish: Eski Camii, meaning "Old Mosque"), can refer to a number of mosques across the former Ottoman Empire:
- Bulgaria
- Eski Mosque, Yambol, Bulgaria
- Greece
- Church of the Acheiropoietos in Thessaloniki, known in Ottoman times as Eski Mosque
- Eski Mosque, Komotini
- Republic of Macedonia
- Turkey
- Eski Mosque, Adana, now Yağ Camii
- Old Mosque, Edirne
- Old Mosque, Mersin
- Old Mosque, Tarsus