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- (Kupianska Miskrada) Osinnik
- (Chuhuiv City Council) Omelchenky
- (Chuhuiv City Council) Omelivka
- (Chuhuiv City Council) Ol’shanka
- (Iziumska Miskrada) Ostrovskogo
- (Iziumska Miskrada) Olhivka
- (Krasnohradskyi Raion) Oleyniki
- (Lozova City Council) Oleksandrivka
- (Lozova City Council) Oddykhne
- (Krasnohradskyi Raion) Orilske
- (Krasnohradskyi Raion) Oleksiivka
- (Kupianska Miskrada) Oleksiivka
- (Kupianska Miskrada) Ostren’kiy
- (Kupianska Miskrada) Oktyabrya
- (Chuhuiv City Council) Ovinnyy
- (Chuhuiv City Council) Oktyabr’skiy
- (Kharkiv City Council) Ostroverkhi
- (Kharkiv City Council) Oktyabr’
- (Lozova City Council) Oleksandrivka
- (Krasnohradskyi Raion) Oleksandrivka
- (Krasnohradskyi Raion) Oleksandrivka
- (Kupianska Miskrada) Orlianske
- (Iziumska Miskrada) Oleksandrivka
- (Bohodukhivskyi Raion) Ocheretove
- (Bohodukhivskyi Raion) Olenivske
- (Bohodukhivskyi Raion) Osnovyntsi
- (Bohodukhivskyi Raion) Odrada
- (Bohodukhivskyi Raion) Oliinyky
- (Bohodukhivskyi Raion) Oleksandrivka
- (Kharkiv City Council) Oleshky