Odor or Odour: What’s the Difference and Which One Should You Use?

“Odor” and “odour” are both correct spellings, but their usage depends on the variety of English. “Odor” is the standard spelling in American English, while “odour” is the standard spelling in British English. Both refer to a smell, especially one that can be noticed by the nose.

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Have you ever typed odor or odour and wondered which spelling is correct? Both words are correct, but the spelling you should use depends mainly on the type of English you are writing.

Odor and odour have the same meaning. They both refer to a smell, especially one that may be unpleasant. Cambridge Dictionary lists odor as the US spelling of odour, while odour is marked as the UK form.

The main difference is therefore not meaning. It is regional spelling.

American English normally uses odor. British English normally uses odour. Canadian English commonly uses odour, too. Oxford also identifies odor as the American form and notes that Canadian English usually uses odour.

In this guide, you will learn the meaning of both words, their history, pronunciation, British and American usage, common mistakes, examples, and simple tips to remember which spelling to choose.

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Odor or Odour – Quick Answer

Odor and odour are both correct spellings of the same word.

The difference is mainly regional:

• Odor = American English
• Odour = British English
• Odour = Usually Canadian English
• Odour = Common in other varieties that follow British spelling

Both words mean a smell, often an unpleasant one. Cambridge Dictionary directly identifies odor as the US spelling of odour.

Examples

American English:

There was a strange odor coming from the kitchen.

British English:

There was a strange odour coming from the kitchen.

The meaning does not change.

Which One Should You Use?

If you are writing for readers in the United States, use odor.

If you are writing in British English, use odour.

Odour is generally the safer choice. Oxford specifically notes that Canadian English usually uses odour.

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What Does Each Word Mean?

Meaning of Odor

Odor is a noun meaning a particular smell. It can describe a pleasant smell, but it is often used for an unpleasant smell.

Examples:

• The room had a strange odor.
• I noticed a strong odor of smoke.
• The garbage produced an unpleasant odor.
• The flowers gave off a sweet odor.

Cambridge defines odor as a particular smell, especially a bad one.

Part of speech: Noun

American pronunciation: /ˈoʊ.dɚ/

Meaning of Odour

Odour has exactly the same basic meaning as odor.

It is the spelling commonly used in British English.

Examples:

• There was a strange odour in the room.
• The kitchen was filled with the odour of fresh bread.
• A strong odour came from the drain.
• The odour of smoke filled the house.

Cambridge defines odour as a smell, often one that is unpleasant.

Part of speech: Noun

British pronunciation: /ˈəʊ.də/

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What Is the Difference Between Odor and Odour?

The simple answer is:

There is no difference in meaning. The difference is spelling and regional usage.

Feature	Odor	Odour
Meaning	A smell	A smell
Part of speech	Noun	Noun
American English	Preferred	Usually not used
British English	Usually not used	Preferred
Canadian English	Less common	Usually preferred
Australian English	Less common	Common
Pronunciation	Same basic word	Same basic word
Formality	Neutral/formal	Neutral/formal
Correct spelling	Yes	Yes

For example:

The odor of smoke was strong.

and

The odour of smoke was strong.

Both sentences are grammatically correct. The spelling simply tells readers which regional variety of English you are following.

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Odor vs Odour: Is One More Correct?

No.

It would be incorrect to say that odor is the correct spelling and odour is wrong, or vice versa.

Both forms are established English spellings.

Cambridge labels odor as the US spelling of odour, while its British entry lists odour and gives odor as the US form.

Think of this difference like:

• color / colour
• favor / favour
• honor / honour
• odor / odour

American English often removes the u in these words, while British English keeps it.

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Origin and History

Etymology of Odor and Odour

Odor and odour come from the same historical word.

Oxford traces odour to Middle English, from Anglo-Norman French, and ultimately from the Latin odor, meaning “smell” or “scent.”

So the two modern spellings are not different words with different origins. They are regional forms of the same word.

Why Does the Spelling Differ?

The difference developed as English spelling changed on different sides of the Atlantic.

British English generally kept the -our spelling in words such as:

• colour
• honour
• favour
• labour
• odour

American English later adopted shorter spellings in many of these words:

• color
• honor
• favor
• labor
• odor

This is why American readers normally expect odor, while British readers normally expect odour.

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British English vs American English

This is where the odor vs odour question becomes easiest to understand.

American English

American English normally uses:

odor

Examples:

• body odor
• bad odor
• unpleasant odor
• strong odor
• odor control

Cambridge’s American entry identifies odor as the US spelling.

British English

British English normally uses:

odour

Examples:

• body odour
• bad odour
• unpleasant odour
• strong odour
• odour control

Oxford lists odour as the British form and odor as the US spelling.

Regional Comparison

Country/Region	Preferred Spelling
United States	odor
United Kingdom	odour
Canada	odour usually
Australia	odour
New Zealand	odour
International writing	Follow your chosen style

The important thing is consistency.

If you start an article using odor, do not switch to odour halfway through unless you are discussing the spelling difference.

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Pronunciation of Odor and Odour

Although the spellings are different, the words are pronounced in essentially the same way within their regional varieties.

American English

Odor: /ˈoʊ.dɚ/

It sounds roughly like:

OH-der

British English

Odour: /ˈəʊ.də/

It sounds roughly like:

OH-duh

Cambridge provides pronunciation information for both forms and shows the regional pronunciation difference.

The spelling difference is much more noticeable than the pronunciation difference.

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Which One Should You Use?

For American Writers

Use odor.

The laboratory detected a chemical odor.

This is the standard spelling for American English.

For British Writers

Use odour.

The laboratory detected a chemical odour.

This matches standard British spelling.

For Canadian Writers

Odour is generally preferred.

Oxford specifically notes that Canadian English usually uses odour.

For Bloggers

Think about your target audience.

If your website targets US readers, use odor.

If your website targets UK readers, use odour.

For an international website, choose one English style and use it consistently.

For Businesses

Follow the spelling style used by your company, market, or brand.

A US company may write:

Odor control products

A UK company may write:

Odour control products

For Academic Writing

Follow the style guide or English variety required by your school, university, journal, or publisher.

Do not randomly switch between American and British spelling.

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Common Mistakes

Mistake 1: Thinking Odour Is Wrong

❌ Odour is a misspelling.

Not true.

Odour is the standard British spelling.

Mistake 2: Thinking Odor Is Wrong

❌ Odor is incorrect because it has no “u.”

Also incorrect.

Odor is the standard American spelling.

Mistake 3: Mixing Both Forms

❌

The room had a strange odor, but the unpleasant odour disappeared later.

This is not necessarily grammatically wrong, but it creates inconsistent spelling if both words are being used with the same meaning in the same English variety.

Better:

The room had a strange odor, but the unpleasant odor disappeared later.

Or, in British English:

The room had a strange odour, but the unpleasant odour disappeared later.

Mistake 4: Changing Your English Style Mid-Article

If you use color, favorite, and honor, you are probably following American spelling. In that case, odor fits the same style.

If you use colour, favourite, and honour, then odour is the better match.

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Everyday Examples

American English Examples

There was a strange odor in the garage.

The refrigerator has a bad odor.

The product helps remove household odors.

I noticed the odor of fresh coffee.

British English Examples

There was a strange odour in the garage.

The refrigerator has a bad odour.

The product helps remove household odours.

I noticed the odour of fresh coffee.

The meaning stays the same.

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Odor or Odour in Business and Technical Writing

You may see these words often in product descriptions, cleaning instructions, environmental reports, and technical documents.

For example:

American English:

This filter helps reduce unpleasant odors.

British English:

This filter helps reduce unpleasant odours.

The choice is based on the publication’s English style.

For professional writing, consistency matters more than choosing one form as universally “correct.”

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Odor vs Odour and Related Words

The same spelling pattern appears in related words.

American English	British English
odor	odour
odors	odours
odorless	odourless
odoriferous	odoriferous

Notice that not every related word changes in the same simple way.

For example, odoriferous is generally spelled without the u in both varieties. So do not assume that every word containing “odor” must have a British -our form.

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Tips to Remember the Difference

Use these simple rules:

• US → odor
• UK → odour
• Canada → usually odour
• Both words mean smell.
• The difference is mainly regional spelling.
• Choose one spelling style and stay consistent.
• If your article uses color, use odor.
• If your article uses colour, use odour.

Easy Memory Trick

Think of the U.

British English keeps the U:

colour → odour

American English drops the U:

color → odor

This is a useful memory trick for learners.

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Quiz

Choose the best answer.

1. Which spelling is standard in American English?

A. Odour
B. Odor
C. Odoor
D. O’dor

2. Which spelling is standard in British English?

A. Odor
B. Odour
C. Odoor
D. Oduor

3. Do odor and odour have the same meaning?

A. Yes
B. No
C. Only in Canada
D. Only in the US

4. Which sentence follows American English?

A. The room had a strange odour.
B. The room had a strange odor.
C. The room had a strange odourr.
D. The room had a strange odoor.

5. Which sentence follows British English?

A. There was a bad odor.
B. There was a bad odour.
C. There was a bad odorr.
D. There was a bad odoour.

6. Which country usually prefers “odour”?

A. United States
B. Canada
C. Only Ireland
D. None

7. What does odor mean?

A. A sound
B. A smell
C. A color
D. A taste

8. Which pair follows American spelling?

A. Colour / odour
B. Color / odor
C. Colour / odor
D. Color / odour

Answers

1. B — Odor
2. B — Odour
3. A — Yes
4. B — The room had a strange odor.
5. B — There was a bad odour.
6. B — Canada
7. B — A smell
8. B — Color / odor

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Fill in the Blanks

Choose odor or odour according to the English variety mentioned.

1. American English: The room had a strange ______.
2. British English: There was a strong ______ from the drain.
3. American English: The product removes household ______.
4. British English: The product removes household ______.
5. American English: I noticed an unpleasant ______.
6. British English: I noticed an unpleasant ______.
7. American English: The garbage produced a terrible ______.
8. British English: The garbage produced a terrible ______.

Answers

1. odor
2. odour
3. odors
4. odours
5. odor
6. odour
7. odor
8. odour

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FAQs

Is odor or odour correct?

Both odor and odour are correct. Odor is the standard American spelling, while odour is the standard British spelling. Canadian English usually prefers odour as well. The two words have the same meaning.

Is odor American or British?

Odor is the American English spelling. British English normally uses odour. Cambridge directly identifies odor as the US spelling of odour.

Is odour British or American?

Odour is the British English spelling. American English normally uses odor. Oxford lists odour as the British form and odor as the US form.

Does odor mean smell?

Yes. Odor means a particular smell, often an unpleasant one. For example, “There was a strong odor in the room.” Cambridge defines it as a particular smell, especially a bad one.

Do Canadians spell it odor or odour?

Canadian English generally uses odour. Oxford specifically notes that Canadian English usually uses odour, although you may encounter odor in some Canadian contexts.

How do you spell odor in British English?

In British English, spell it odour. For example, write “There was a strange odour in the room.”

How do you spell odour in American English?

In American English, spell it odor. For example, write “There was a strange odor in the room.”

Are odor and odour pronounced differently?

The pronunciation is very similar, although British and American accents have their normal pronunciation differences. Cambridge gives separate British and American pronunciations for the two forms.

Which spelling should I use for my website?

Choose the spelling that matches your target audience. Use odor for a primarily American audience and odour for a primarily British audience. If your website serves an international audience, select one style and use it consistently.

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Conclusion

The odor vs odour question has a simple answer: both spellings are correct.

The difference is mainly regional. Odor is the standard spelling in American English, while odour is the standard spelling in British English. Canadian English generally favors odour as well.

Both words mean the same thing. They describe a smell, often an unpleasant one. For example, an American writer may say, “There was a strange odor in the room,” while a British writer may say, “There was a strange odour in the room.”

The easiest way to remember the difference is to look at the U. British English keeps the U in words such as colour, honour, favour, and odour. American English often removes it: color, honor, favor, and odor.

If you are writing for a specific audience, match its spelling style. Most importantly, stay consistent throughout your article, website, school assignment, or professional document.

So, the next time you wonder if to write odor or odour, do not ask which one is “correct.” Ask which English variety you are using.