The correct spelling is Mother’s Day – with an apostrophe before the s and both words capitalized.

Quick Scoop: The spelling

  • Standard and official form: Mother’s Day.
  • The apostrophe shows possession: it’s the day for your mother , so it uses the singular possessive mother’s.
  • Both Mother’s and Day are capitalized because it’s the name of a holiday (a proper noun).

You may sometimes see “Mothers Day” or “Mothers’ Day,” but these are not the usual or officially recognized forms in modern English; style guides, dictionaries, and the original founder all use Mother’s Day.

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