Nickname with O
- Olive
- Ozzy
- Oli
- Otto
- Ozzie
- Oliver
- Olli
- Omar
- Opie
- Olivia
- oscar
- Owen
- Oldie
- Olaf
- Osito
- Advertisement
- Oma
- Otter
- Oso
- Omi
- Otis
- Ola
- old man
- Opa
- oreo
- Ogre
- Odie
- opal
- Ori
- Obi
- Orlando
- Oddball
- Oni
- Oppie
- Olga
- Oppa
- Obie
- Old man
- Opi
- oompa loompa
- Orion
- Oliv
- Orly
- Oppy
- Oak
- Ole
- Old fart
- Ona
- oprah
- Ovi
- Octo
- Oggie
- Old lady
- Oldy
- oggy
- Ottie
- Omega
- Owie
- Owl
- octopus
- OMG
- Advertisement
- Ophelia
- oslo
- Oddy
- Old boy
- Oswald
- Ody
- Oddie
- Onion
- Oh baby
- Olivier
- Ossie
- Ossi
- ossy
- Okie
- Odin
- Ora
- OLLY
- Obelix
- Orange man
- Old Sport
- Oaf
- Osky
- one and only
- Oscar the Grouch
- Oct
- oger
- Oti
- oman
- Odi
- oly
- Osi
- oops
- Otty
- Odd ball
- osvaldo
- Obby
- O-man
- Old timer
- osh
- Oop
The words in the list Nickname with O come from players of the word game City, Country, River.