Both spellings refer to the same thing. Neither one is wrong. The only real question is which spelling fits your audience or style guide.
The Short Answer
Catalog is the standard American English spelling.
Catalogue is preferred in British, Australian, and Canadian English.
If you’re writing for an American audience, use catalog. If you’re writing for a British or international audience, use catalogue. If your organization has a style guide, follow that.
What Does the Word Mean?
A catalog (or catalogue) is a list or collection of items, usually organized in a way that makes them easy to find or browse.
The word works as both a noun and a verb.
As a noun:
- a product catalog from a retailer
- a library catalog listing available books
- an art exhibition catalogue
- a university course catalogue
As a verb:
- to catalog a collection of photographs
- researchers cataloguing newly discovered species
- the archivist catalogued every document by date
Both spellings follow the same grammar rules. You’d say catalogued or cataloged, cataloguing or cataloging — again, depending on regional preference.
Why Do Two Spellings Exist?
English spelling was not fully standardized until the 18th and 19th centuries. Noah Webster, the American lexicographer behind Webster’s Dictionary, deliberately simplified many English spellings in the early 1800s to make American English more consistent and easier to learn. Words ending in -ogue were shortened to -og in many cases.
That’s why Americans write:
- catalog instead of catalogue
- dialog instead of dialogue (though dialogue is still common in American English too)
- analog instead of analogue
- monolog instead of monologue (though monologue remains the dominant form even in the US)
Not all of Webster’s simplifications stuck equally. Catalog took firm hold in American English. Catalogue remained standard everywhere else.
Which Form Is More Common Where?
| Spelling | Dominant in |
| catalog | United States |
| catalogue | United Kingdom, Australia, Canada, most international English |
One small wrinkle: in American English, catalogue isn’t unheard of, especially in more formal, literary, or academic contexts. Some American institutions and publishers still use it. But catalog is by far the default.
Outside the US, catalog appears occasionally — particularly in technology contexts, where American English has strong influence. Software documentation, for example, often uses catalog globally.
Verb Forms by Region
| Base | American English | British English |
| catalog / catalogue | cataloged, cataloging | catalogued, cataloguing |
British English generally doubles the final consonant before a suffix when the last syllable is stressed — but catalogue drops the ue before adding -ed or -ing, giving catalogued and cataloguing. American English keeps things simpler: cataloged, cataloging.
Practical Advice
Writing for a US audience? Use catalog.
Writing for a UK, Australian, or Canadian audience? Use catalogue.
Writing for a global or mixed audience? Pick one and stay consistent. Catalogue is the safer choice internationally since it’s recognized everywhere, including in the US.
Following a company or publication style guide? Use whatever that guide specifies and don’t deviate.
Using software, databases, or technical documentation? Catalog tends to dominate regardless of region, largely because of American influence in the tech industry. Many library systems, data platforms, and e-commerce tools use catalog as the default term.
Quick Examples
She flipped through the furniture catalog before placing her order. (American English)
The museum published a beautiful catalogue to accompany the exhibition. (British English)
The librarian spent weeks cataloging the new arrivals. (American English)
Scientists are cataloguing thousands of insect species in the rainforest. (British English)
The data catalog makes it easy to find the right dataset. (common in tech, regardless of region)
The bottom line: catalog and catalogue are the same word. Choosing between them is purely a matter of where you’re writing and who you’re writing for.
Read more:
- Assume vs. Presume: Is There a Real Difference?
- Dependent vs Dependant: Which Spelling Is Correct?
- All Right vs. Alright: Is There a Difference?
- Apart vs. A Part: They Mean the Opposite of Each Other
It’s Afini, I am the author at Vocab press, a website focused on animal facts with clear visuals and simple guides. I research and share accurate, easy-to-understand information for readers of all ages. My goal is to make learning about animals fun, trustworthy, and simple. I follow fact-based writing and keep content updated, helpful, and people-first. Thank you for reading.
