Regions of Japan
- Oshika-mura
- Kamitsushimachō-oshika
- Oshigome
- Oshideno Hana
- Ōshiba Jima
- Oshi
- Oshaku Jima
- Ose Zaki
- Ōse Zaki
- Ōse-zaki
- Ō Seto
- Ō Seto
- Ō Seto
- Ō-seto
- Ōse-saki
- Ōse Zaki
- Ōse Bana
- Kosei Jima
- Ōsebanare-jima
- Ōse-bana
- Ō Se
- Ō-se
- Ō-se
- Ō-se
- Ōsa Yama
- Ōsawano-machi
- Ōsawano-machi
- Ōsawa-dake
- Ōsawa
- Ōsawa
- Ōsato-mura
- Ōsato Gawa
- Ōzato
- Ōzato
- Ōsasu
- Ohsasazawa-yama
- Ōsasa-yama
- Osare-yama
- Osan Se
- Ōsa-ne
- Osa-mura
- Osako
- Ōsaki Yama
- Ōsaki-yama
- Ōsaki-wan
- Ōsakishimo Jima
- Ōsaki-seto
- Ōsakino Hana
- Ōsakiga Hana
- Ōsaki-mura
- Osaki-mura
- Ōsakikami Jima
- Ōsaki-hana
- Ōsaki Bana
- Ōsaki Bana
- Ōsaki Bana
- Ōsaki Bana
- Ōsaki-bana
- Ōsaki Bana
- Ōsaki-bana
- Ōsaki Bana
- Ōsaki-bana
- Ōsaki Eki
- Ō Saki
- Ō-saki
- Ō Saki
- Ō Saki
- Ō Saki
- Ōsaki Hana
- Ō-saki
- Okina Zaki
- Ō Saki
- O-saki
- Ō Saki
- Ōsaki Bana
- Ō Saki
- Ō Saki
- Cape Osaki
- Ōsaki
- Ōsaki
- Osaki
- Ōsaki
- Osaki
- Mitsushimachō-osaki
- Shimotsuchō-ōsaki
- Ōsaki
- Ōsaki
- Ō Saki
- Ō Saki
- Ō-saki
- Tazaki-kannon Zaki
- Ō Saki
- Ufu Saki
- Ōsaka Wan
- Osaka-shi
- Ōsakano-hana
- Ōsakamachi
- Osaka-machi
- Ōsaka Kō
- Ōzakai Yama
- Ōsaka Heiya
- Ōsaka-fu
- Osakabe Gawa
- Osakabe
- Ōsaka
- Osaka
- Osaka
- Osai
- Osada-mura
- Ōsa-chō
- Aosa Hana
- Oryūzako-byōchi
- Oryūzako
- Ōru-saki
- Oroshi-mura
- Oroshika Wan
- Oroshi
- Oroshi
- Orono Shima
- Oroku-mura
- Oroku
- Urugami Shima
- Oritomachi
- Oritate
- Oritachi
- Oriseno-hana
- Orio
- Orio
- Kitanadachō-orino
- Origuchi Saki
- Ōri Gawa
- Origami Bana
- Orido Wan
- Orido
- Orido
- Ore-shima
- Oreai
- Ōra-shima
- Ōra-saki
- Oran-se
- Ōura
- Ōra Machi
- Ōra-kawa
- Ōra-gun
- Orachi-yama
- Uppurui Wan
- Uppurui Bana
- Uppuruichō
- Oppe-gawa
- Oppamachō
- Ōoka-mura
- Ōoka Gawa
- Ōoka
- On Zen
- Onzaki-yama
- Onyū-mura
- Ōnyū Jima
- Onyū-gun
- Onyu
- Ōnyū
- Onyū
- On’ya
- Onuma
- Ōnuma
- Ō Numa
- Ōnuki-machi
- Onuka
- Ontake-san
- On-take
- Mount Ontake
- Matsuyama
- Onsen-chō
- Onozu
- Ufu Yama
- Ōnoyama
- Onoya
- Onouechō
- Onouechō
- Ōno Seto
- Ono Zaki
- Ono-saki
- Ōno Saki
- Ono-mura
- Ono-mura
- Ono-mura
- Onomoto-mura
- Ōnomi-mura
- Onomichi-shi
- Onomichi-itozaki Kō
- Onomichi
- Ōnochō
- Ōnomachi
- Ōno-machi
- Ōno-machi
- Ōno-kō
- Ōnoki
- Ōnogame Jima
- Ōnojō Shi
- Onoichi
- Ōnohara Jima