River with O
- Ohio river
- Oder
- Ottawa
- Oklahoma
- Oklahoma river
- Odra
- orinoco
- Orlando river
- Olga
- Obey river
- Otay
- obed river
- olive
- Otter Creek
- Osage
- Oak Orchard River
- Otay River
- Olympus
- ottawa river
- orion
- Ottowa
- Orljava
- Omaha river
- Owl
- Orinoko
- Ovens
- Onyx
- Otto
- Oka
- Obed
- Oswego
- Ocoee
- Oneida
- ozark
- One
- oman river
- Okavango
- Ogden
- olympia
- ophelia
- Oker
- oregan river
- Olt
- olivia
- orwell
- oval river
- Okechobee
- orange county river
- ona
- Onions
- only
- Oil
- olentangy
- over
- Oise
- Ober
- olan
- omar
- omaha
- Okanogan
- Olly
- Ottowa River
- OREGON
- Obion River
- Ouse river
- osiris
- Ostsee
- owen
- oolong
- old
- oxe
- Oyster
- Opera
Słowa na liście River with O pochodzą od graczy gry słownej Państwa Miasta.