Colour vs Color: UK, US and Australian Spelling

Colour and color are the same word with the same meaning: color is the American spelling, and colour is the spelling used in the UK, Australia, Canada, New Zealand and Ireland. Neither is a mistake; each is simply correct in its own variety of English.

That makes your choice a question of audience, not grammar. If you are writing for readers in Chicago, use color. If you are writing for readers in Manchester or Melbourne, use colour. The tricky parts are the derived words, the proper nouns that break the pattern, and the places (like code) where only one spelling works.

Quick answer: Color = American English. Colour = British, Australian, Canadian, Irish and New Zealand English. Meaning and pronunciation are identical. Pick one spelling for a document and keep it consistent, including in related words like colorful/colourful.

On this page

1. Who Uses Which Spelling
2. Meaning, Grammar and Pronunciation
3. Where the U Came From (and Where It Went)
4. The Whole Colour Family
5. Colour in Context: 24 Example Sentences
6. US vs UK vs Australia
7. Proper Nouns, Brands and Code
8. Choosing a Spelling for an International Audience
9. Common mistakes
10. A Memory Trick That Works
11. Practice quiz
12. The Practical Takeaway

Who Uses Which Spelling

Here is the standard spelling across the main English-speaking countries. "Standard" means what schools teach, what newspapers print and what government style manuals expect.

Notice that Canada sides with Britain here. Canadians tend to keep -our endings while adopting American forms for other word groups, which is why a Canadian might write colour and tire in the same paragraph.

Meaning, Grammar and Pronunciation

The word works the same way in every country. It is most often a noun, but it is also a perfectly ordinary verb and appears in many compounds.

As a noun

As a noun, colour/color means the property of an object produced by the way it reflects light (red, blue, green), and by extension skin tone, vividness or interest. You can talk about "the colour of the sea," "a splash of color," or a piece of writing that has plenty of "local colour."

It can also be countable ("three colors") or uncountable ("she added colour to the room"). In the plural, colours has a special British and Australian sense: a regiment's flag, or the clothing and badges of a sports team or school ("he wore the club colours").

As a verb

As a verb, it means to add color to something ("the children coloured the map") or, figuratively, to influence ("his own experience colored his judgment"). The figurative use is common in serious writing and reporting.

Pronunciation

Both spellings are pronounced the same: KUH-ler in American English and KUH-luh in most British and Australian accents, where the final r is not sounded. The u in colour is silent. It never changes how the word sounds, which is exactly why Webster thought it could go.

Where the U Came From (and Where It Went)

The word comes from the Latin color, which had no u at all. It entered English in the Middle Ages through Anglo-Norman and Old French, where it was usually written colour or culur. English borrowed many words of this type from French: honour, favour, labour, odour, humour.

For several centuries, English writers spelled these words inconsistently. You can find both -or and -our forms in early modern printing. By the eighteenth century, British usage had largely settled on -our, and Samuel Johnson's influential 1755 dictionary helped fix that preference.

Noah Webster's reform

In the United States, the lexicographer Noah Webster took the opposite path. In his dictionaries (most famously An American Dictionary of the English Language, 1828), he favored color, honor, labor and similar forms. His reasons were partly practical, since the u added nothing to pronunciation, and partly patriotic: he believed a new nation deserved its own standard.

It is worth being precise here. Webster did not invent color; the spelling already existed and matched the Latin original. What he did was give it the authority of a national dictionary used in American schools, and that settled the matter in the US.

To see the same split in a closely related word, read our guide to favourite vs favorite, which follows exactly the same pattern.

The Whole Colour Family

Once you choose a spelling, every related word should follow it. Here is the family in both forms, with a few surprises.

The last few rows are where careful writers trip up. Coloration comes more directly from the Latin stem, so it frequently appears without a u even in British publications. Scientific terms such as colorimeter and colorimetry are spelled the same way internationally.

Colour in Context: 24 Example Sentences

Each example below uses the spelling a local writer would choose. The American examples use color, and the British and Australian ones use colour.

Everyday life

1. My sister in Ohio painted her kitchen a soft sage color.
2. The leaves in Vermont change color in early October.
3. Grandma in Leeds still colours her hair a bright auburn.
4. Which colour do you want for the bedroom, the blue or the cream?
5. The jacarandas turn Brisbane's streets a brilliant purple colour every spring.
6. Our toddler spent the afternoon coloring in a dinosaur book.
7. He looked a bit off colour this morning, so I told him to stay home. (British/Australian: slightly unwell)

Work and email

8. Could you send the brochure proofs in full color by Friday?
9. Please use the approved brand colours from the style guide.
10. Our Sydney office has asked for colour-coded rosters for the holiday period.
11. The client in Denver wants the logo reworked in a single color.
12. Let's colour-code the spreadsheet so overdue invoices stand out.
13. I've attached the color samples Marcus requested after Tuesday's meeting.

Academic and technical

14. The study examined how color influences consumer choices in grocery stores.
15. Students at the University of Melbourne analysed the colouration of local reef fish.
16. Colour perception depends on the cone cells in the retina.
17. The researchers used a colorimeter to measure the concentration of the solution.
18. Her dissertation traces how colour symbolism changed in Victorian painting.

News and reporting

19. The city of Austin unveiled a new color-coded system for wildfire alerts.
20. Thousands lined the streets of Glasgow as the parade added colour to a grey afternoon.
21. Fans in Perth wore their team's colours to the grand final.
22. Critics said the senator's past remarks colored the debate.
23. The Bureau of Meteorology uses colour bands to show fire danger ratings.
24. The museum in Philadelphia restored the mural's original colors.

Sentences 21 and 7 show two senses that are distinctly British and Australian: colours as team insignia, and off colour meaning unwell. In American English, off-color usually describes a joke that is slightly rude, not a person who feels sick.

US vs UK vs Australia

United States

American English uses color consistently, and so does almost every American publisher, newspaper and school. Major American style guides and dictionaries list color as standard. Seeing colour in an American publication usually signals a British author, a quotation, or a proper name.

United Kingdom

British English uses colour in all general writing. British readers recognize color immediately, mostly from software and American media, but it looks foreign in a British newspaper or school essay. The sense of colours as a flag ("Trooping the Colour") is strongly associated with British tradition.

Australia

Australian English follows British spelling: colour, colourful, discoloured. Australian newspapers, school curricula and government writing all use the u. The famous exception is the Australian Labor Party, which settled on the American-style spelling in the early twentieth century and has kept it ever since, even though Australians write labour everywhere else. South Australia also has a town called Victor Harbor, another historical -or spelling that survives only as a name.

Australians also tend to prefer -ise endings, so the verb is usually colourise rather than colourize. For more on that choice, see organise vs organize.

Canada and elsewhere

Canada uses colour, as do Ireland and New Zealand. Canadian publishers often describe their spelling as a blend, but on -our words Canada sides firmly with Britain.

Proper Nouns, Brands and Code

Some contexts override your house spelling.

• Names stay as they are. A British newspaper writing about Technicolor or the Pantone Color Institute keeps the American spelling, because those are names. Likewise, an American writer quoting the Australian Labor Party keeps Labor.
• Code uses color. CSS properties (color, background-color), HTML attributes and most programming libraries are American. If you write colour: red; in a stylesheet, the browser ignores it.
• Interfaces can differ from code. Many apps localize their menus, so a British user might see "Font colour" while the underlying code still says color.

Choosing a Spelling for an International Audience

If your readers are spread across several countries, choose the spelling of your main market and stay consistent. Mixing colour in one paragraph with color in the next looks careless in any country.

A few practical guidelines:

• Write for the reader, not yourself. An Australian company selling mainly to American customers often uses American spelling on its US website.
• Set your spellchecker to the right variety (English US, English UK or English Australia). It will catch most -or/-our slips automatically.
• Publishers and large organizations usually have a style guide that settles the question. If yours does, follow it.

For a full overview of these patterns across dozens of words, our British vs American vs Australian spelling guide covers the main groups in one place.

Common mistakes

Most errors come from mixing systems or from overcorrecting.

❌ The colour scheme looks great, but the colors on page two are off. ✅ The colour scheme looks great, but the colours on page two are off. (Pick one spelling and keep it.)

❌ She chose a colourful dress for the party in San Diego, in an American publication. ✅ She chose a colorful dress for the party in San Diego.

❌ We support the Australian Labour Party. ✅ We support the Australian Labor Party. (A proper name keeps its own spelling.)

❌ p { colour: navy; } ✅ p { color: navy; } (CSS only recognizes the American spelling.)

❌ The colourimeter readings were recorded hourly. ✅ The colorimeter readings were recorded hourly. (Technical term, same everywhere.)

❌ He has a nice colour. (meaning he looks healthy, in American English) ✅ He has good color / He looks healthy. (The British idiom "off colour" does not travel well to the US.)

A Memory Trick That Works

Think of the u as a passport stamp: coloUr has been to the UK. Americans dropped the extra letter when they crossed the Atlantic, so the American word is shorter.

If you need a second hook, remember that the British spelling contains our, as in "our Queen's English," while the American spelling contains or, which is simply the shorter choice.

Practice quiz

Choose the spelling that fits each sentence and audience.

1. (US newspaper) The Grand Canyon glows a deep orange ______ at sunset. (color / colour)
2. (UK school report) Amelia uses ______ confidently in her artwork. (color / colour)
3. (Australian news) Supporters wore their club ______ to the match at the MCG. (colors / colours)
4. (CSS file) h1 { ______: #333; } (color / colour)
5. (Canadian magazine) The ______ leaves of Algonquin Park draw thousands of visitors. (colorful / colourful)
6. (Any audience) The ______ party was founded in Australia in the 1890s. (Labor / Labour)

Answers

1. color – American English drops the u.
2. colour – British English keeps the u.
3. colours – Australian spelling follows British, and colours here means team insignia.
4. color – CSS only accepts the American spelling.
5. colourful – Canada keeps the British -our ending.
6. Labor – The party's name uses the -or spelling regardless of country.

The Practical Takeaway

You never need to worry that colour or color is wrong; you only need to know who is reading. Use color for American readers and colour for readers in Britain, Australia, Canada, Ireland and New Zealand, carry that choice through every related word, and leave proper names and code exactly as they are. Once that habit is set, the same thinking will handle grey vs gray, honour/honor, neighbour/neighbor and the rest of the family.