Grey or gray: which is correct?

Correct
grey (UK) / gray (US)
Avoid
gray (in UK English)
Avoid
grey (in US English)
Summary

Correct: grey (UK) / gray (US) — Avoid: gray (in UK English) / grey (in US English). Grey / gray = the colour between black and white; dull, overcast; (of hair) turning white.

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: grey is the standard British spelling; Merriam-Webster gives gray as the American standard with grey as a variant. Proper names keep their own spelling (Earl Grey tea, greyhound in both varieties).

Examples

  • The sky turned grey (UK) / gray (US) before the storm.
  • He wore a grey suit to the interview.
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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)