The correct spelling is Valentine’s Day —with a capital V, an apostrophe + s, and a capital D.

Quick breakdown

  • Write it as: Valentine’s Day.
  • The apostrophe shows possession: it’s the day of Saint Valentine, so it’s written as “Valentine’s,” not “Valentines.”
  • Common wrong versions you might see are “Valentines Day” or “Valentine Day,” but these are considered incorrect in standard written English.

If you want the full formal version, you can also write St. Valentine’s Day or Saint Valentine’s Day , which follow the same capitalization and apostrophe rules.