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
- Opa
- old man
- Ogre
- Odie
- oreo
- Opal
- Ori
- Obi
- Orlando
- Oddball
- Oni
- Oppie
- Olga
- Obie
- Oppa
- Opi
- Old man
- oompa loompa
- Orly
- Oliv
- Orion
- Oppy
- Oak
- Ona
- Ole
- oprah
- Old fart
- Ovi
- oggy
- Oggie
- Octo
- Oldy
- Old lady
- Owie
- Omega
- Owl
- Ottie
- octopus
- oslo
- Advertisement
- Ophelia
- OMG
- Oddy
- Old boy
- Oswald
- Oddie
- Olivier
- Ody
- Ossi
- Okie
- ossy
- Oh baby
- Ossie
- Onion
- Odin
- Obelix
- Ora
- Old Sport
- OLLY
- Orange man
- Osky
- Oaf
- Oct
- oger
- Oscar the Grouch
- one and only
- Odd ball
- Otty
- Oti
- Odi
- Osi
- oops
- osvaldo
- oly
- oman
- old boy
- Oilman
- Oren
- open
- opra
The words in the list Nickname with O come from players of the word game Categories game.