Organize vs. Organise
“Organize” and “organise” are not a simple one-form-per-country pair. Cambridge lists “organize” as its headword and notes “UK also organise,” so British usage allows both forms.
Both spellings occur in British English, while “organize” is the normal US spelling; follow the required dictionary or house style.
Key details
Choose the right form
| Meaning / situation | Form / construction | Decision |
|---|---|---|
| normal US spelling | organize | Use “organize” in US English. |
| British English under a style that uses -ise | organise | Use “organise” when the governing UK style prefers -ise. |
| British English under a style/dictionary that permits or prefers -ize | organize | Do not label “organize” as non-British solely because it uses -ize. |
Quick tests
Meaning / construction test
Are you following a defined regional and house style?
If yes: Use the spelling that style requires: US English normally uses “organize,” while British English can use either “organize” or “organise” depending on style.
If no: If no style is mandated, choose one accepted convention and apply it consistently.
Caveat: This is not a simple US-correct/UK-wrong split: British English permits both spellings under different style traditions, so the house style is decisive.
Examples
We will organize the files before the meeting.
“Organize” is the normal US spelling and is also accepted in British English under some styles.
The UK publication chose organise throughout.
“Organise” follows a common British -ise convention.
The British house style uses organize with -ize.
British English does not universally require the -ise spelling.
Further guidance
Core difference
Cambridge explicitly notes “UK also organise” under “organize.”
Fast Test
Match the spelling to the regional or house style required by the document, then keep that choice consistent.
Variant Boundary
Do not claim that “organize” is exclusively American; British English also uses -ize in established styles.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- Organize — Cambridge Dictionary (opens in a new tab)Cambridge Dictionary · Organize headword with UK also organise variant note