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