Authorized or Authorised: US vs UK Spelling Explained?

Authorized and authorised are both correct spellings. Authorized is the standard form used in American English, while authorised is the usual British English form.

Both words have the same meaning: officially given permission, approval, or authority.If you are writing for a US audience, use authorized.

If you are following common British English spelling, authorised is the usual choice. However, British English also accepts authorize and related -ize forms, so the simple “US = -ize, UK = -ise” rule is not absolute. Oxford lists authorize as a British English form as well.

Table of Contents

Quick Answer

Both are correct. The difference is mainly regional spelling.

Spelling	Common Usage	Example
Authorized	American English	Only authorized users can access the account.
Authorised	British English	Only authorised users can access the account.

Both forms mean officially permitted or given authority. Cambridge defines authorized as having official permission to do something, and identifies authorised as the usual UK spelling.

For US English: authorized
For common UK English: authorised

What Does Authorized or Authorised Mean?

Authorized and authorised mean that someone has been officially given permission, approval, or authority to do something.

For example:

Only authorized employees can enter the room.
Only authorised employees can enter the room.
The manager authorized the payment.
The manager authorised the payment.

The meaning does not change when the spelling changes. Cambridge defines authorize as giving official permission for something to happen or giving someone official permission to do something.

Authorized: The American English Spelling

Authorized is the standard spelling you will normally use in American English.

It can be the past tense or past participle of authorize, and it can also work as an adjective.

Examples

The manager authorized the payment.
The company has authorized the purchase.
Only authorized personnel may enter.
She is an authorized representative.
The bank authorized the transaction.

Cambridge lists authorized as the US form and gives examples such as “authorized personnel” and “authorized representative.”

For a website, business document, email, or article aimed specifically at readers in the United States, authorized is the natural spelling.

Authorised: The Common British English Spelling

Authorised is the usual British English spelling of the same word.

It has the same meaning and performs the same grammatical functions as authorized.

Examples

The manager authorised the payment.
The company has authorised the purchase.
Only authorised personnel may enter.
She is an authorised representative.
The bank authorised the transaction.

Cambridge labels authorised as the usual UK form of authorized.

Authorized vs Authorised: What Is the Real Difference?

The key difference is spelling convention, not meaning.

American English generally uses the -ize form:

authorize
authorized
authorizing
authorization

Common British usage often uses the -ise form:

authorise
authorised
authorising
authorisation

But there is an important detail that many spelling guides leave out: British English is not limited to -ise spellings. Oxford lists authorize and its forms as British English, while also noting authorise as a British English form.

So calling authorized “wrong in British English” would be too broad.

Is Authorized American or British English?

Authorized is strongly associated with American English, but it is not exclusively American.

Cambridge identifies authorize as the US form and says the UK usually uses authorise. Oxford, however, lists authorize as a British English form too.

Therefore:

US English: authorized is standard.
Common UK English: authorised is usual.
British English: authorized is also an accepted spelling under the Oxford convention.

This distinction matters if you want your article to be completely accurate rather than relying on an oversimplified US-versus-UK rule.

Is Authorised American or British English?

Authorised is the spelling most commonly associated with British English.

Cambridge specifically marks authorised as the usual UK form.

If you are following a British style that uses -ise spellings, choose authorised.

For example:

Only authorised personnel may enter the building.

Authorized or Authorised in a Sentence

Both spellings work in the same sentence structures.

American English

The director authorized the new project.

Common British English

The director authorised the new project.

Another example:

American English

Only authorized employees can access these files.

Common British English

Only authorised employees can access these files.

The spelling changes, but the meaning and grammar remain the same.

Authorized vs Authorised in Formal Writing

Both forms are appropriate in formal writing when they match the English variety being used.

You may see the word in:

business documents
contracts
government writing
banking
software and technology
security notices
academic writing
professional emails
product information

For example:

The authorized representative signed the agreement.

or:

The authorised representative signed the agreement.

The choice between the two is not a question of which one sounds more formal. The important consideration is the spelling system your document follows.

Do Not Mix the Word Family

If you choose a particular spelling convention, keeping related words consistent makes your writing cleaner.

American English	Common British English
authorize	authorise
authorizes	authorises
authorized	authorised
authorizing	authorising
authorization	authorisation
unauthorized	unauthorised

Cambridge lists authorization as the US form and authorisation as the usual UK form.

For example, if your document follows the common British -ise convention, this is consistent:

The manager authorised the payment and provided written authorisation.

For American English:

The manager authorized the payment and provided written authorization.

Authorized or Authorised: Which One Should You Use?

Choose based on your target audience and style guide.

Use Authorized When:

You are writing in American English.
Your main audience is in the United States.
Your publication follows US spelling conventions.
Your organization uses American English.

Use Authorised When:

You are following the common British -ise convention.
Your publication or organization uses that spelling system.
Your style guide specifically requires -ise forms.

If a publisher, school, company, or organization has its own style guide, follow that guide consistently.

Is Authorized Wrong in British English?

Not necessarily.

This is one of the most important details to remember.

It is common to see authorised in British English, and Cambridge identifies it as the usual UK form. But Oxford also lists authorize as a British English form.

So the statement “authorized is always American and wrong in British English” is too simple.

A more accurate rule is:

Authorized = standard American form and also accepted in some British English usage.
Authorised = usual British form.

Is Authorised Wrong in American English?

It is not the standard US spelling.

American English normally uses authorized, so writers targeting a US audience should use that form for consistency.

For example:

US: The payment was authorized.

Common UK: The payment was authorised.

The words mean the same thing.

Authorized vs Authorised: Common Examples

Here are some of the most common expressions:

American English	Common British English
authorized personnel	authorised personnel
authorized dealer	authorised dealer
authorized representative	authorised representative
authorized user	authorised user
authorized access	authorised access
authorized payment	authorised payment
authorized signatory	authorised signatory
authorized distributor	authorised distributor

The spelling changes, but the underlying meaning remains the same.

Authorized vs Authorised: Common Mistakes

Treating One Spelling as Completely Wrong

Seeing authorised does not mean the word is misspelled. Likewise, authorized is not simply a typo when you encounter it in British-oriented material.

Mixing Regional Spellings

A document can look inconsistent when it switches between regional spelling systems without a reason.

For example:

The manager authorised the payment and requested authorization.

If you are intentionally following a British -ise convention, the mixed forms may look inconsistent. A consistent version would be:

The manager authorised the payment and requested authorisation.

Or, in American English:

The manager authorized the payment and requested authorization.

Assuming Spelling Changes the Meaning

It does not. Authorized and authorised refer to the same idea of official permission or authority.

Authorized or Authorised: Easy Way to Remember

If you are writing for the United States, remember:

authorized → US

If you are following the common British -ise spelling:

authorised → UK

But remember the important exception: British English can also use authorize and authorized, particularly under Oxford-style -ize conventions.

FAQs

Is authorized or authorised correct?

Both are correct. Authorized is the standard American spelling, while authorised is the usual British spelling. Oxford also recognizes authorize as a British English form.

Is authorized American or British?

Authorized is standard in American English. It is also accepted in some British English usage, including the Oxford convention.

Is authorised British English?

Yes. Authorised is the usual British English spelling of authorized.

Do authorized and authorised mean the same thing?

Yes. Both mean officially permitted or given official authority.

Which spelling should I use in the US?

Use authorized for standard American English.

Which spelling should I use in the UK?

Authorised is the usual British spelling, although authorize/authorized is also an accepted British English form under some style conventions.

What is the difference between authorization and authorisation?

They have the same meaning. Authorization is the standard US form, while authorisation is the usual UK form.

What is the difference between authorizing and authorising?

Authorizing is the American spelling, while authorising is the common British spelling. Cambridge lists authorizing as the present participle of authorize and notes that British English usually uses authorise.

Should I use authorized and authorised in the same article?

Usually, choose one spelling system and use it consistently. If your article is specifically comparing the two forms, however, using both is necessary.

Final Answer

Authorized and authorised are both correct.

Authorized → standard American English
Authorised → usual British English
Meaning → officially permitted or given authority
US writing → choose authorized
Common British -ise style → choose authorised

One final detail is worth remembering: British English also accepts authorize and authorized, so the difference is not a rigid rule that says “-ize is American and -ise is British.” Oxford explicitly lists authorize as a British English form.

For most US-focused writing, the simple choice is:

Authorized ✓
Authorised → common British variant