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Writing Tips has been archived and won’t be updated before it is permanently deleted.

For the most up-to-date content, please consult Writing Tips Plus, which combines content from Writing Tips and The Canadian Style. And don’t forget to update your bookmarks!

To begin your search, go to the alphabetical index below and click on the first letter of the word you are searching for.

O, Oh

Both O and Oh are relatively rare in everyday writing, but may appear in titles or dialogue.

Capitalize O when formally addressing a person or thing. No punctuation is needed with O.

  • The students sing "O Canada" as loudly as possible every morning.
  • "O wild West Wind, thou breath of Autumn’s being ..." is the opening line of Shelley’s "Ode to the West Wind."

The interjection or exclamation Oh is followed by a comma, exclamation mark or em–dash.

  • Oh, no! I’ve dropped my keys down the elevator shaft.
  • Oh! The northern lights are amazing tonight!
  • Oh—are you really going to Nunavut for your summer holiday?