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