Costumes that Start with O

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A dress up party is the perfect time to show off your creativity. If you’re scratching your head for costume ideas, try these fancy dress ideas all starting with the letter O!

Have a look at these wacky and wonderful outfits that kick off with this awesome letter. From powerful gods to sea creatures, get ready to have a blast at any fancy dress party with these outstanding costume ideas!

Olympian God/Goddess

Dive into the world of Greek mythology by transforming into an Olympian god or goddess. Whether you choose Zeus, Hera, Athena, or Apollo, these majestic figures offer a regal and powerful costume option. Add accessories like a laurel wreath or a golden trident to complete the look.


Embrace your inner sea creature with an octopus costume. Make eight flowing tentacles using colorful fabric and attach them to a headpiece, hat or even an umbrella. Add some suction cup details and bold, bright colors to create a visually stunning and unique ensemble.

Oompa Loompa

Take a trip to Willy Wonka’s chocolate factory by dressing up as an Oompa Loompa. This iconic character from Roald Dahl’s “Charlie and the Chocolate Factory” is instantly recognizable with their orange skin, green hair, and distinctive white overalls. Don’t forget the catchy songs to complete the transformation!

Olympics Winner

This is an easy costume idea. Simply dress up in some athletic wear and purchase or make a gold medal to hang around your neck. Perfect as a last minute fancy dress costume idea!

Friends dressed up as Olympics winners

Opera Singer

Showcase your love for the performing arts by becoming an opera singer. Create an elegant and dramatic look with a flowing gown or a dapper tuxedo. Add a faux microphone and practice your best opera singing for an entertaining and sophisticated costume.

Obi-Wan Kenobi (Star Wars)

Star Wars enthusiasts can channel the wisdom and power of the Jedi by becoming Obi-Wan Kenobi. Don a Jedi robe, add a lightsaber, and perfect your Jedi mind tricks. This classic character is a surefire way to impress fellow Star Wars fans.

Oreo Cookie

Unleash your sweet side by becoming everyone’s favorite cookie – the Oreo! Craft a giant Oreo costume using cardboard, paint, and some serious DIY skills. Whether you go classic black and white or throw in a creative twist, you’re sure to be a treat at the party.


Transform into a mythical creature straight out of fairy tales by becoming an ogre. With layers of ragged clothing, green face paint, and perhaps some faux warts, you’ll embody the essence of these fantastical beings. Add a club or a gnarly staff for an extra touch of ogre authenticity.


Keep the peace and command attention as a law enforcement officer. Whether you go for a classic police officer look or opt for a more creative interpretation, a badge, hat, and authoritative demeanor will make you the law of the Halloween land.

Police Officer Costume

Oktoberfest Person

Raise a stein and celebrate the spirit of Oktoberfest by dressing as a traditional Bavarian reveler. Lederhosen, a checkered shirt, and a jaunty hat complete the look. Don’t forget a mock beer stein for an extra festive touch!

Oktoberfest Costume


Go wild with an adorable orangutan costume. Utilize faux fur, a playful orange hue, and a cheeky expression to capture the charm of these jungle-dwelling creatures. Consider adding a few branches or bananas to your ensemble for a touch of authenticity.

Oscar the Grouch

Dive into the world of Sesame Street by becoming everyone’s favorite grouch, Oscar. Craft a garbage can costume and embrace your inner curmudgeon. Bonus points for perfecting Oscar’s grumpy attitude and iconic green fur.


Channel the spirit of the Wild West by becoming an outlaw. Deck yourself out in rugged clothing, a cowboy hat, and perhaps a bandana to conceal your identity. Add a toy gun holster for a classic outlaw look that’s ready for a showdown.


Spread your wings and soar into the night as a wise and mysterious owl. Craft feathered wings and a beak, and don a brown or gray ensemble to complete the feathery look. This costume is a hoot and perfect for those who appreciate nature’s nocturnal creatures.

Owl Dress up Costume

Ocean Creature

Dive deep into the mysteries of the ocean by becoming a unique sea creature. Whether you choose a mystical mermaid, a shimmering fish, or a tentacled sea monster, the ocean is full of inspiration for a costume that’s both enchanting and awe-inspiring.

With these fun costume ideas starting with the letter O, you’re bound to make a lasting impression at your your next party.

Whether you choose a movie character, or a creature from the deep sea, the key is to have fun and let your creativity shine. So, go ahead have fun dressing up in one of these costume ideas.

More Costume Ideas

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