Catalogue or Catalog? UK vs US
📖 Prefer the grown-up version? Read the adult edition →
Catalogue and catalog are the same word — British English keeps a silent -ue on the end, and American English can drop it. Neither is wrong; you just match your reader. The one thing that makes this pair trickier than most is that the American side only shortens some of the family — so it's worth knowing which.
The one difference
- UK: full ending -ogue → catalogue, dialogue, analogue
- US: often just -og → catalog, analog, dialog
| UK (-ogue) | US (-og) |
|---|---|
| catalogue | catalog |
| analogue | analog |
| dialogue | dialogue* |
| monologue | monologue* |
*In ordinary US writing, dialogue and monologue usually keep the full spelling; the clearly-shortened ones are catalog and analog. "Dialog" is standard mainly for the computing term (a "dialog box").
Why there are two spellings
These words came from French, spelled -ogue, and Britain kept that ending. American spelling reformers trimmed the silent -ue off some of them — but never finished the job — which is why catalog is fully American but dialogue is often still spelled in full even in the US. So this pattern is half a rule, not a whole one.
The golden rule: match your reader
- UK reader or exam → catalogue, analogue, dialogue.
- US reader → catalog, analog (but dialogue is fine in full).
The silent -ue is the whole difference, and because it's silent, it's the easy bit to forget in UK writing — and the easy bit to over-chop in US writing.
The computing corner
One spelling is the same everywhere: the dialog box on a computer. Software has spelled it dialog for decades, so that short form is standard on both sides of the Atlantic — even though a conversation in a story is a dialogue in the UK. If you mean the pop-up window, it's dialog; if you mean people talking, UK writers use dialogue.
Why writers slip
In UK writing the mistake is dropping the silent -ue (because you see American catalog and analog everywhere online). In US writing the mistake is over-dropping it — chopping the tail off monologue or epilogue, which keep it. Either way, the fix is one quick proofreading look: there are only ever a handful of -ogue words in any piece, so they're easy to check.
Words that never change, either way
Some -ogue words keep their full spelling in both countries — synagogue, demagogue, pedagogue — because they came from Greek and were never shortened. So the "American drops the -ue" idea only ever applies to a couple of common, everyday words (catalog, analog); the formal and old ones stay -ogue on both sides. If a word feels literary or unusual, assume the full ending.
Why only some words shortened
Notice the split in the table above: the words that trimmed in America — catalog, analog — are the practical, everyday ones, used constantly in shops and technology. The words that stayed full — dialogue, monologue, prologue — live in stories and scripts, where the traditional spelling still feels right. It's a rough pattern rather than a rule, but it's why this family is half-shortened instead of all-or-nothing like colour/color.
The bigger picture: silent letters
That silent -ue is one of many silent letters in English — the k in knee, the b in doubt, the gh in night. They're mostly fossils from older spellings or the languages the words came from. Because you can't hear them, the way to master any of them is the same: learn the word by sight, and give it a deliberate check when you proofread. The little -ogue family is a neat set to practise the habit on, because there are never many of them in one piece.
Words that look like the family but aren't
Watch out for a little group that looks as though it belongs here but never shortens: vogue, rogue, brogue and fugue. None of these ever drops the -ue, on either side of the Atlantic - there's no vog or rog. The reason is that they aren't really part of the catalogue/dialogue family at all; the -ogue in catalogue comes from a Greek word meaning "word" or "speech," while vogue and rogue just happen to end in the same letters. So the "American drops the -ue" idea only touches the true members (catalog, analog) and leaves these lookalikes completely alone. The safe habit: if a word isn't about speaking, listing or reasoning, assume it keeps its full ending everywhere, and give it a quick check rather than a confident chop.
Quick check
1. catalog — UK or US?
Answer
2. analogue — UK or US?
Answer
3. Writing for a British reader: catalog or catalogue?
Answer
4. A pop-up window on any computer is a dialog or dialogue box?
Answer
5. In a UK short story, two people talking is written as dialog or dialogue?
Answer
The easy way to stay right
Because this family is so small, you don't need a rule at all — you need a short list. In UK writing, keep every -ogue full. In US writing, shorten just catalog and analog, use dialog only for the computer box, and leave the rest (dialogue, monologue, prologue, epilogue) in full. That's the entire pattern, and it fits on a sticky note. Once you've decided which country you're writing for, checking these words takes seconds, because there are only ever two or three of them in anything you write.
Where next
- Catalogue, Dialogue, Analogue (UK) — the British spelling in full.
- Catalog, Dialog, Analog (US) — the American spelling in full.
- Colour or Color? UK vs US — the biggest UK/US spelling split.