O
- (Prylutskyi Raion) Ozeriany
- (Nizhyns’ka Mis’krada) Ozeriany
- (Koriukivskyi Raion) Ostapivka
- (Prylutskyi Raion) Ostapivka
- (Novhorod-Sivers’ka Mis’krada) Osmaky
- (Koriukivskyi Raion) Osmaky
- (Nizhyns’ka Mis’krada) Osich
- (Novhorod-Sivers’ka Mis’krada) Orlivka
- (Chernihiv Raion) Orlivka
- (Novhorod-Sivers’ka Mis’krada) Orlykivka
- (Nizhyns’ka Mis’krada) Ombysh
- (Chernihiv Raion) Oleshnia
- (Koriukivskyi Raion) Oleshnia
- (Chernihiv Raion) Olbyn
- (Chernihiv Raion) Okuninovo
- (Koriukivskyi Raion) Okhramiievychi
- (Chernihiv Raion) Odyntsi
- (Prylutskyi Raion) Obychiv
- (Novhorod-Sivers’ka Mis’krada) Obolonnia
- (Nizhyns’ka Mis’krada) Obmachiv
- (Nizhyns’ka Mis’krada) Ostriv Nadii
- (Nizhyns’ka Mis’krada) Osynivka
- (Novhorod-Sivers’ka Mis’krada) Obiednane
- (Novhorod-Sivers’ka Mis’krada) Ostrov
- (Chernihiv Raion) Olyshivka
- (Chernihiv Raion) Oster