Historic means significant enough to make history: "a historic peace deal", "a historic win at Wembley". Historical means simply belonging to or concerned with the past, important or not: "historical records", "a historical novel". Every historic event is historical, but most historical events are not historic.
The core difference
The distinction is one of significance. Historic carries a judgement: this matters, this will be remembered. Historical is neutral and descriptive: this happened in the past, or this concerns the study of the past.
The bill your grandmother paid in 1961 is historical. The moon landing is historic.
How to use each
- Historic: "They signed a historic agreement in Belfast." "Tonight was a historic night for the club." "The house has historic status and cannot be altered."
- Historical: "She writes historical fiction set in the 1790s." "Historical evidence suggests otherwise." "We looked at historical rainfall data."
The test that settles it
Swap in momentous or landmark. If the sentence still works — "a momentous agreement", "a landmark win" — use historic. If instead past or of history fits — "past rainfall data", "a novel set in the past" — use historical.
The memory trick
Historical has the extra syllable, so give it the everyday, unremarkable job — there is far more ordinary past than there is history-making past. Historic is short and punchy, like the headline it usually appears in.
How strictly is it observed?
Reasonably strictly, and it is worth honouring — but it is a usage convention rather than a grammatical rule, and the edges are soft. "Historical significance" and "historic significance" are both in wide, respectable use, meaning slightly different things: the first means significance to historians, the second means being important in itself. Careful writers keep the distinction; you will still encounter historical used loosely for momentous events in perfectly professional prose. What does read as an error is the reverse — using historic for anything merely old or past-related, as in "historic records", which the swap test catches immediately.
A historic or an historic?
Both appear. A historic is now the more common choice in British and American writing, because the h is pronounced. An historic is a traditional variant, surviving in formal and journalistic prose, and it is not an error. Pick one and be consistent. The same goes for a/an historical and a/an hotel.
Watch the buildings sense
In heritage contexts, historic is a term of art: a historic building is one formally recognised for its importance and often legally protected. "Historic England" and the American "National Register of Historic Places" both use it that way. Do not substitute historical there.
Frequently Asked Questions
Is it "a historic occasion" or "a historical occasion"?
A historic occasion, if you mean one that will be remembered. Historical occasion would just mean an occasion that took place in the past, which is rarely what anyone wants to say.
Should I write "a historic" or "an historic"?
Both are acceptable. "A historic" is more common today and matches the pronounced h; "an historic" is a traditional variant still used in formal writing. Just be consistent within a piece.
Which one for a novel set in the past?
Historical fiction. The genre name is fixed, and it describes setting rather than importance.