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Humorous is correct worldwide.

Humourous is in common usage in Commonwealth countries.

I do not believe this to be true. Cite please? -- 22:10, 21 April 2009 (UTC)
I don't believe it either; I don't think I've ever seen it here in the UK, and it isn't in the Chambers or Collins dictionaries. It appears to be an obsolete spelling, though: [1] Equinox 22:13, 21 April 2009 (UTC)
I agree, like honour and honorable; in fairness while British complain about American spellings, they are actually truer to their Latin roots than British ones (compare color#English and color#Latin).
While I have no citation, I definitely have the opinion that this spelling is in common usage today in the UK. Perhaps less common than humorous, but far from obsolete. A quick google search, for example, on, or shows many instances of its use. --David Edgar 15:19, 9 September 2009 (UTC)
Strange that it's not in major print dictionaries, then. I think it's a common error, non-standard. Most of the matches on the Guardian site, for instance, are user-generated content (personal ads etc.). What does the OED say about it, I wonder? Equinox 17:24, 9 September 2009 (UTC)
I feel strongly that it is not a common UK usage: more of a common UK mistake, really. ODWE actually says don't use this spelling, in its entry for humorous. Best wishes DisillusionedBitterAndKnackered 17:47, 15 October 2009 (UTC)
The spelling is mentioned in the OED with a couple of cites from the early 1800s, but it is not currently common in the UK, nor is Shakespeare's spelling: "humerous", but even that is occasionally seen in those newspapers' blogs. Dbfirs 20:26, 13 August 2011 (UTC)

I have added a usage note from the Oxford Dictionary, with citation, that this is a misspelling. O'Dea (talk) 20:55, 3 April 2014 (UTC)