Costumes Starting with O

Our Costumes Starting with O collection brings together original, outrageous, and outstanding ideas for your next dress-up event.

Transform into a classic Ogre, become a legend as Obi-Wan Kenobi, or step into the spotlight as an Opera Singer. Choose a spooky twist with an Old Witch, or go silly with an Onion or Octopus novelty costume. History buffs can dress as Oliver Cromwell, while storybook fans might prefer Olivia the Pig.

These O costumes suit Halloween, alphabet parties, and stage performances. They’re ideal for groups—Ogres and Princesses, Ocean-themed Octopus parties, or Star Wars duos like Obi-Wan and Anakin. Kids and adults will both find great options here.

For extra ideas beyond O, check our full costumes A–Z range and keep the inspiration flowing.