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Best Costumes Starting with O for 2023

If you’re looking for some great costumes starting with O then you’ve come to the right place. We’ve got heaps of fun costumes that start with O for everyone. We have costumes beginning with O for adults, kids, babies, pets and couples.

You’ll find lots of fun ideas for Halloween costumes beginning with O that are also perfect for other dress up occasions such as costume parties, book week and dress up starting with O parties.

Whether you’re looking to buy or DIY a fun costume – from Octopus costumes to Oompa Loompa costumes – we’ve got you covered.

costumes starting with o

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Costumes Starting with O

We wanted to compile all the most fun and unique costumes that start with O in the one place. If you are invited to an O themed party –  or dress up as something that starts with the first letter of your name – definitely scroll down for all the photos. Or if you just wanted some quick, fun inspiration for a costume for Halloween – we can help. Whether you decide to buy or DIY a costume – see the fun ideas below.

All of the costumes pictured (and many more that couldn’t fit on the page) are available to be purchased right here.  If you see an adults costume you like, you’ll find that there are often similar costumes for kids and pets as well in the link below each category.

We have costumes that will make you stand out in the crowd – as well as low-key costumes such as a t-shirt or a costume hat/headband. At the very least you could do an easy costume with the letter O t-shirt pictured below.

letter o shirt
Letter O T-shirt

 Costumes that Start with O

In this article you’ll find:

  • Womens Costumes
  • Mens Costumes
  • Plus Size Costumes
  • Baby Costumes
  • Pets Costumes
  • Couples Costumes

All the costumes pictured in this article are available to purchase and as well as many others that aren’t pictured in this article. You can find all the costume ideas beginning with O that are available to purchase right here.

We have the fancy dress beginning with O list divided into categories such as characters, things, animals, celebrities, food and more. Scroll down to see all the amazing costume ideas that you probably haven’t thought of.

Things Beginning with O Fancy Dress

  • Ocean
ocean dress costume
Ocean Dress Costume
  • Oars
oars costume
Oars Costume
  • Oven
oven costume
Oven Costume
  • Origami
Origami Costume
Origami Costume
  • Oasis
  • Olympics
  • Organizer
  • Organ
  • Oxygen
  • Oak Tree
  • Orchard
  • One

Find all the things costumes starting with O right here.

Characters Starting with O Costumes

  • Obi Wan Kenobi
obi wan kenobi costume
Obi Wan Kenobi Costume
  • Olaf
olaf costume
Olaf Costume
  • Oscar the Grouch
oscar the grouch costume
Oscar the Grouch Costume
  • Olive Oyl
olive oyl costume
Olive Oyl Costume
  • Oswald
oswald costume
Oswald Costume
  • Optimus Prime
optimus prime costume
Optimus Prime Costume
  • Orville
orville costume
Orville Costume
  • Oliver
oliver costume
Oliver Costume
  • Olympia
olympia costume
Olympia Costume
  • Oompa Loompa
oompa loompa costume
Oompa Loompa Costume
  • Olivia
  • Otis
  • Obelix
  • Odie
  • Osmosis Jones

Find all the characters beginning with O costumes right here.

Celebrities Beginning with O Costumes

  • Oprah Winfrey
  • Olivia Newton John
  • Owen Wilson
  • Olivia Rodrigo
  • Orlando Bloom
  • Otis Redding
  • Olivia Wilde
  • Oliver Stone
  • Oliver Hardy
oliver hardy costume
Oliver Hardy Costume
  • Ozzy Osbourne
Ozzy Osbourne costume
Ozzy Osbourne Costume

Historical Costumes that Start with O

  • Oscar Wilde
  • Orville Wright
  • Oskar Schindler
  • Osman I
  • Barack Obama
barack obama costume
Barack Obama Costume

Find all the famous people (celebrities and historical) fancy dress starting with O costumes right here.

Food Beginning with O Costumes

  • Onion 
onion costume
Onion Costume
  • Orange
orange costume
Orange Costume
  • Oregano
oregano costume
Oregano Costume
  • Oreo
oreo costume
Oreo Costume
  • Olives
olive jar costume
Olives Costume
  • Orange Juice
orange juice costume
Orange Juice Costume
  • Oatmeal
oatmeal costume
Oatmeal Costume
  • Olive Oil
  • Oysters
  • Omelette
  • Okra
  • Onion Rings
  • Oxtail
  • Oat Milk
  • Oyster sauce

Find all the food starting with O costumes right here.

Animals Beginning with O Costumes

  • Octopus
octopus costume
Octopus Costume
  • Owl
owl costume
Owl Costume
  • Otter
otter costume
Otter Costume
  • Ostrich
Ostrich Costume
Ostrich Costume
  • Orangutan
orangutan costume
Orangutan Costume
  •  Ox
Ox costume
Ox Headband
  • Ocean creature
ocean creature costume
Ocean Creature Costume

 Find all the animals starting with O costumes right here.

Pet Costumes that Start with O

  • Oscar the Grouch
oscar the grouch costume dog
Oscar the Grouch Costume for Pets
  • Octopus
octopus costume dog
Octopus Costume for Pets
  • Oompa Loompa
Oompa Loompa Costume dog
Oompa Loompa Costume for Pets
  • Owl
owl costume for dog
Owl Costume for Pets
  • Ox
ox costume dog
Ox Costume for Pets
  • Oktoberfest Dog
oktoberfest costume dog
Oktoberfest Costume for Pets
  • Olaf
olaf costume dog
Olaf Costume for Pets
  • Optimus Prime
optimus prime costume dog
Optimus Prime Costume for Pets

Find all the pet costumes starting with O right here.

Couples Costume Ideas Starting with O

  • Oreos
oreos couples costume
Oreos Couples Costume
  • Olive Oyl and Popeye 

Olive Oyl and Popeye Couples Costume

Find all the couples costumes starting with O right here.

Jobs that Start with O Costume Ideas

  • Office Manager
  • Office Clerk
  • Obstetrician
  • Optometrist
  • Orthodontist
  • Orthopedic Surgeon
  • Occupational Health and Safety officer

Countries Starting with O Costumes

  • Oman
Oman Flag Shirt
Oman Flag Shirt

Why not wear a tshirt with the Oman flag on it – or their traditional dress.

 Colors for Costumes Beginning with O

  • Orange
  • Olive
  • Orchid
  • Ochre
  • Oak Brown
  • Oak
  • Ocean Blue
  • Ocean Green
orange morphsuit
Orange Morphsuit

Why not wear a costume in one of the O colors above? Or wear a orange or olive morphsuit if you dare!

Sports Starting with O Costume Ideas

  • Off-Road Racing
  • Oztag
  • Outrigger Canoeing
  • Orienteering
  • Obstacle Course Racing
  • Ocean Rowing

Baby Costumes Starting with O

Firstly you must check out this gorgeous Mom and baby costume: An Octopus and Diver costume!

mom and baby octopus and baby costume Here are some other fun baby costumes you don’t want to miss.

  • Oscar the Grouch
oscar the grouch costume
Oscar the Grouch Costume
  • Octopus
baby octopus costume
Baby Octopus Costume
  • Olaf
baby olaf costume
Baby Olaf Ccostume
  • Owl
baby owl costume
Baby Owl Costume
  • Optimus Prime
kids optimus prime costume
Optimus Prime Costume for Toddlers
  • Olivia
baby olivia costume
Olivia Costume for Toddlers
  • Odie
baby odie costume
Baby Odie Costume
  • Oompa Loompa
baby oompa loompa costume
Baby Oompa Loompa Costume
  • Ox
  • Otis the Owl

Find all the baby costumes that start with O right here.

If you need a costume party theme don’t miss our fun guide to the best dress up party themes for adults.

Costumes Beginning with O

If you’ve looked through the full list right here – but are still looking for a more a low-key costume then check out these t-shirts below. They totally count as an easy O costume.

ox tshirt
Ox T-Shirt


oscar the grouch tshirt
Oscar the Grouch T-Shirt

 I sincerely hope you love these fun fancy dress beginning with O ideas and you found the perfect fancy dress costume idea for your next dress up party.

Don’s miss our other fun costume ideas:

Costumes starting with A

Costumes starting with B

Costumes starting with C

Costumes starting with D

Costumes starting with E

Costumes starting with F

Costumes starting with G

Costumes starting with H

Costumes starting with I

Costumes starting with J

Costumes starting with K

Costumes starting with L

Costumes starting with M

Costumes starting with N

Costumes starting with P

Costumes starting with R

Costumes starting with S

Costumes starting with T

Big Guy Halloween Costume Ideas

Please pin for later or so that you can find us for next Halloween or dress up party.

costumes that start with o


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