Colour or Color: British vs American English Spelling
Posted on 17th April by Admin
Few spelling differences between British and American English are as instantly recognisable as colour versus color. For British readers, color stands out on the page as distinctly American — just as colour looks distinctly British to American readers. If you are writing in British English, using the correct spelling is a basic standard of professionalism and consistency.
This guide covers the difference between the two, explains which countries use which spelling, and introduces the broader -our vs -or pattern that affects a whole family of common English words.
The Quick Answer
Colour is the correct British English spelling — used in the UK, Australia, New Zealand, Ireland and most countries that follow British English conventions.
Color is the correct American English spelling — used in the United States and Canada.
Both spellings refer to the same thing. The difference is purely one of regional convention. Using color in a British English document is an Americanism — and one that is noticed immediately by careful readers.
Colour in British English
In British English, colour — with the -our ending — is the standard and universally expected spelling. It is used throughout all formal, academic and professional British writing:
The colour of the sky at dusk
A colour photograph
The colour-coded system
Colourful language
A colourless solution
The -our ending in British English is the original Latin and Old French derived form — colour comes from the Old French coulour and Latin color. British English retained the French-influenced -our spelling; American English reverted closer to the Latin original.
Color in American English
In American English, color — without the U — is standard. American spell-checkers flag colour as incorrect, and all American publications use color consistently.
The -or ending in American English was one of the simplifications championed by Noah Webster in the eighteenth and nineteenth centuries, who argued that American spelling should be more consistent with Latin roots and less influenced by French spelling conventions.
The Broader -our vs -or Pattern
Colour and color are part of a large and important group of words where British English uses -our and American English uses -or. This is one of the most systematic differences between the two varieties. Key examples include:
If you are writing in British English, all of these words take the -our ending. Applying this consistently across the full group will significantly improve the accuracy of your British English writing.
Examples in Context
British English — Colour
The designer chose a muted colour palette for the new branding.
She has an eye for colour that makes her illustrations stand out.
Colourful writing engages readers and holds their attention.
The document uses a colour-coded system to highlight key sections.
American English — Color
The designer chose a muted color palette for the new branding.
She has an eye for color that makes her illustrations stand out.
Colorful writing engages readers and holds their attention.
Common Mistakes in British English
Incorrect: The flag features red, white and blue colors. Correct: The flag features red, white and blue colors… wait — Correct in British English: The flag features red, white and blue colors is American. The British English version is: The flag features red, white and blue colours.
Incorrect: Her behavior was exemplary. Correct: Her behaviour was exemplary. (Same -our pattern)
Why Do British and American English Differ?
The divergence in -our vs -or spellings — and many other British/American spelling differences — can be largely traced to Noah Webster, the American lexicographer who published his influential American Dictionary of the English Language in 1828. Webster deliberately simplified a number of English spellings to make them more phonetically consistent and to distinguish American English from British English as part of a broader project of establishing a distinct American cultural identity. His dictionary standardised color, honor, favor and dozens of other -or spellings that have been used in American English ever since.
Why It Matters in Writing
In professional and academic writing, spelling consistency is a fundamental quality standard. Mixing colour and color — or any of the -our/-or pairs — within a single document immediately signals inconsistency to a careful reader.
For UK university students, British English spelling is the expected default. Using American spellings throughout an essay submitted to a UK university is a consistency error that tutors notice and may comment on. In professional writing for UK audiences, American spellings can suggest that a document has been drafted using American tools or sourced from American material without thorough editing.
If you want to be certain your document uses correct and consistent British English spelling throughout, our professional proofreading service checks all spelling conventions and consistency across your entire document. Our professional copy editing service provides a comprehensive review of spelling, grammar, clarity and structure.
Frequently Asked Questions
Is colour or color correct in the UK?
In the UK, colour — with the U — is the correct British English spelling. Color (without the U) is the American English spelling. Using color in British English writing is considered an Americanism and an error in formal contexts.
Is it colourful or colorful in British English?
In British English, the correct spelling is colourful — with the U, following the same -our pattern as colour. Colorful is the American English spelling.
Why does British English have a U in colour?
The U in colour reflects the Old French origin of the word — coulour — which British English retained. American English moved back toward the Latin root color during the spelling reforms of the eighteenth and nineteenth centuries, dropping the U in the process.
Do Australian and New Zealand English use colour or color?
Both Australian and New Zealand English follow British conventions and use colour — with the U. The same applies to Irish English and most other varieties of English outside North America.
Is it honour or honor in British English?
In British English, the correct spelling is honour — following the same -our pattern as colour. Honor is the American English spelling. This applies to all related words: honourable (British), honorable (American); honorary (same in both).
Summary
Colour is correct in British English
Color is correct in American English
The -our vs -or pattern applies to a whole family of words including honour, favour, behaviour and neighbour
Australian, New Zealand and Irish English follow British conventions
Consistency throughout your document is essential
If you found this guide useful, you might also want to read our guide on travelling or traveling — another common British vs American English spelling difference that follows a clear grammatical rule.
Our professional proofreading service ensures your document uses correct and consistent British English spelling — including the full family of -our words.
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