O
- (Rovenkivskyi Raion) Orlivske
- (Shchastynskyi Raion) Oleksandrivka
- (Sievierodonetskyi Raion) Oleksandrivka
- (Dovzhanskyy Rayon) Oleksandrivka
- (Svativskyi Raion) Oleksandropil
- (Svativskyi Raion) Ozero
- (Sievierodonetskyi Raion) Oleynikovo
- (Svativskyi Raion) Oleksapil
- (Svativskyi Raion) Osykove
- (Luhanskyi Raion) Oleksandrivsk
- (Alchevskyi Raion) Olenivka
- (Alchevskyi Raion) Ogorodnyy
- (Alchevskyi Raion) Osipovka
- (Alchevskyi Raion) Ol’khovaya
- (Sievierodonetskyi Raion) Oleksandropillia
- (Shchastynskyi Raion) Oknyne
- (Starobilskyi Raion) Oleksiivka
- (Starobilskyi Raion) Orikhove
- (Shchastynskyi Raion) Orekhov
- (Starobilskyi Raion) Osynove
- (Starobilskyi Raion) Osikovo
- (Starobilskyi Raion) Orlov
- (Dovzhanskyy Rayon) Orlovka
- (Shchastynskyi Raion) Orikhove-Donetske
- (Sievierodonetskyi Raion) Orikhove
- (Rovenkivskyi Raion) Orikhove
- (Luhanskyi Raion) Orikhivka
- (Sievierodonetskyi Raion) Oskolonivka
- (Dovzhanskyy Rayon) Ol’khovka
- (Dovzhanskyy Rayon) Okhulchansk