303 Best Cat Names Starting With O in 2026
Cat names often reflect the cat’s personality or may be chosen by the owner because of their similarity to something else, such as a relative’s name.
The most popular cat names have changed over time. Some stay popular for centuries, others only briefly.
Names like “Mittens,” “Whiskers,” “Smudge”, and “Buttons” have all made it to the list of most popular cat names in history.
Browsing by letter is the easiest way to find a name, so here is a list of cat names starting with O.
I’ve tried to cover plenty of ground, drawing on celebrities, pop culture, literature, history, film, nature and food.
Cat Names Starting With O
- O.B.
- O.J.
- O’Neil
- O’Brien
- O’Malley
- Oaf
- Oahu
- Oak
- Oakes
- Oakleaf
- Oakley
- Oaklynn
- Oasis
- Oatcake
- Oatmeal
- Oats
- Obadiah
- Obama
- Obediah
- Obelix
- Obella
- Obera
- Oberon
- Obi
- Obi-Wan
- Obie
- Oboe
- Obscura
- Obsidian
- Obstinate
- Ocabar
- Occi
- Occupant
- Ocean
- Oceana
- Ocelot
- Ochre
- Ocitar
- Octave
- Octavia
- Octavius
- October
- Octopussy
- Oda
- Odan
- Odd
- Oddball
- Oddibe
- Oddie
- Ode
- Odea
- Odeipus
- Odelia
- Odell
- Odella
- Odera
- Odessa
- Odetta
- Odette
- Odie
- Odile
- Odin
- Odo
- Odon
- Odysseia
- Odysseus
- Odyssey
- Oedipus
- Oedipuss
- Ofel
- Ofelia
- Offred
- Ogden
- Ogies
- Ogopogo
- Ogre
- Oh Henry
- Oh-So
- Ohana
- Ohanna
- Oiler
- Oingo
- Oink
- Oisin
- Ojeda
- Okalani
- Okavango
- Okee
- Okeli
- Okesha
- Oki
- Okie
- Okinawa
- Oklahoma
- Okra
- Oksana
- Olaf
- Olantha
- Old Crow
- Old Faithful
- Old Fashioned
- Old Man
- Old Master
- Old Rasputin
- Oleander
- Oleg
- Olena
- Oleo
- Olesia
- Olga
- Olhausen
- Olin
- Olinda
- Olio
- Olita
- Olivarez
- Olive
- Olive Oil
- Oliver
- Olivet
- Olivette
- Olivia
- Olivine
- Olla
- Ollendorff
- Olli
- Ollie
- Ollie-Cat
- Olliecat
- Olliver
- Oly
- Olympia
- Omaha
- Omaira
- Omar
- Omari
- Ombra
- Ombre
- Omega
- Omelet
- Omen
- Omi
- Omni
- Omniscious
- Omonoia
- On or Off
- Ona
- Onassis
- Onaya
- OnChoi
- Ondine
- Ondre
- Oni
- Onika
- Onion
- Onions
- Only
- Onnee
- Onslow
- Ontario
- Ontiveros
- Onya
- Onyx
- Onyxia
- Oogie Boogie
- Oolong
- Oona
- Oops
- Oota Dabun
- Opal
- Opaline
- Opera
- Opey
- Ophelia
- Ophira
- Opie
- Opium
- Oprah
- Oprah Whiskers
- Ops
- Optimistic
- Optimus
- Opus
- Or
- Oracle
- Oralia
- Oralie
- Oran
- Orane
- Orange
- Orange Juice
- Orangehead
- Oranges
- Orangey
- Orangie
- Orangina
- Orangy
- Orbit
- Orca
- Orchard
- Orchid
- Orco
- Ord
- Ordinary
- Ore
- Orecchiette
- Ored
- Oregano
- Orella
- Oren
- Orenda
- Orengo
- Oreo
- Organa
- Oriana
- Oriel
- Orient
- Origami
- Orin
- Orinda
- Oriole
- Orion
- Oriondo
- Orla
- Orlanda
- Orlando
- Orlok
- Orlon
- Orman
- Ormond
- Ornament
- Ornery
- Orphan
- Orphelia
- Orpheus
- Orphia
- Orrin
- Orsino
- Orson
- Ortansia
- Orton
- Orville
- Orvis
- Orwell
- Orzo
- Osaka
- Osamu
- Osborn
- Osborne
- Oscar
- Osceola
- Osgood
- Oshi
- Osiris
- Oskar
- Oslo
- Osman
- Osmanthus
- Osmond
- Osmunda
- Oso
- Ossian
- Ostara
- Oswald
- Oswald
- Oswell
- Otari
- Othello
- Other
- Other Guy
- Otis
- Otter
- Ottie
- Otto
- Oui
- Ouija
- Ouisa
- Outi
- OutKast
- Outlaw
- Outrigger
- Ovale
- Ove
- Oven
- Owen
- Owena
- Owl
- Ox
- Oxalis
- Oxbow
- Oxford
- Oxo
- Oxy
- Oyen
- Oyster
- Oz
- Ozark
- Ozma
- Ozone
- Ozymandias
- Ozzie
- Ozzy
- Ozzy Osbourne
If you’re getting your first cat, read our top tips for new cat owners.
More cat name ideas:
Browse our archive of cat name posts for more ideas.
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