Semper Fidelis is a Latin motto translating to "always faithful". It is the motto of:

  • The City of Exeter, in Devon, England; the motto signifies the city's loyalty to the English Crown, and was suggested by Elizabeth I in a letter of 1588 to "The Citizens of Exeter", in recognition of a gift of money towards the fleet that defeated the Spanish Armada.
  • HMS Exeter, a Royal Navy warship named after the City of Exeter.
  • The United States Marine Corps, the ground fighting element of the United States Navy, who often reduce it to Semper Fi; the motto signifies the dedication that individual Marines have to the Corps and to their fellow fighting men and women, for the rest of their days and beyond.