River with O
- Ohio river
- Oder
- Ottawa
- Oklahoma
- Oklahoma river
- Odra
- orinoco
- Orlando river
- Olga
- Obey river
- obed river
- Otay
- olive
- Otter Creek
- Otay River
- Olympus
- Osage
- Oak Orchard River
- ottawa river
- orion
- Onyx
- Omaha river
- Ottowa
- Orinoko
- Orljava
- Ovens
- Owl
- Oka
- Otto
- Ocoee
- Obed
- Oswego
- Oker
- ozark
- Okavango
- One
- Olt
- oman river
- ophelia
- oregan river
- olympia
- Ogden
- Oneida
- OREGON
- Obion River
- ona
- oolong
- olan
- owen
- Ostsee
- osiris
- Okechobee
- Okanogan
- oval river
- orwell
- only
- Ober
- Oil
- olentangy
- Oise
- over
- olivia
- old
- oxe
- orange county river
- omar
- Onions
- Ottowa River
- Olly
- Ouse river
- omaha
- Oyster
- Opera
Kata-kata dalam daftar River with O berasal dari pemain permainan kata ABC Lima Dasar.