Favourite or favorite: which is correct?

Correct
favourite (UK) / favorite (US)
Avoid
favorite (in UK English)
Avoid
favourite (in US English)
Summary

Correct: favourite (UK) / favorite (US) — Avoid: favorite (in UK English) / favourite (in US English). Favourite / favorite = preferred above all others; the person or thing one likes best.

Both spellings are correct in their own variety; pick one and use it consistently.

Part of speech
adjective / noun
Source
Oxford / Merriam-Webster

Why

Oxford: favourite keeps the -our- of favour in British English, like colour and honour; Merriam-Webster gives favorite and favor as the American standard, following the -or spellings promoted in Webster's 1828 dictionary.

Examples

  • Jazz is my favourite (UK) / favorite (US) kind of music.
  • Which is your favourite tool in the editor?
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Checked against
Merriam-Webster / Oxford
Spelling authority
Merriam-Webster · Oxford English Dictionary / Oxford spelling · SCOWL
Commonly confused and non-standard forms
64
Dictionary
Hunspell en_US / en_GB / en_AU / en_CA · Dictionary license: MIT AND BSD (SCOWL combined licence)