Colour or color: which is correct?

Correct
colour (UK) / color (US)
Avoid
color (in UK English)
Avoid
colour (in US English)
Summary

Correct: colour (UK) / color (US) — Avoid: color (in UK English) / colour (in US English). Colour / color = the property of reflecting light of a particular wavelength; red, blue, green and so on. Both spellings are correct in their own variety.

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

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

Why

Oxford gives colour, honour, flavour and neighbour as the British standard; Merriam-Webster records the -or spellings that Noah Webster promoted in his 1828 dictionary as the American standard. Choose one variety and keep it consistent throughout a document.

Examples

  • What colour (UK) / color (US) is the new logo?
  • The walls were painted a warm colour.
Check your own text: Spell Checker
Catch typos and common misspellings in American or British English, with suggestions, checked right in your browser.
Open tool

Native spelling engine

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)