The Royal and Military Order of Saint Hermenegild (Spanish: Real y Militar Orden de San Hermenegildo) is both a general military honor and a legion created by King Ferdinand VII of Spain on 28 November 1814.

Given the desire of the King to create a distinction of extraordinary rank, comparable to others traditional honours, it was decided to put the Order under the Patronage of Saint Hermenegild, who was the Visigoth King of Seville who was martyred in defence of the Christian faith in the sixth century and who is the patron saint of the Spanish Armed Forces.

... recompensar y distinguir a los oficiales generales, oficiales y suboficiales del Ejército de Tierra, de la Armada, del Ejército del Aire, de los Cuerpos Comunes de las Fuerzas Armadas y del Cuerpo de la Guardia Civil, por su constancia e intachable conducta en el servicio, a tenor de lo que establecen las Reales Ordenanzas para las Fuerzas Armadas.It is declared that The Order intends "to compensate and to distinguish to the general officers, officers and warrant officers of the Spanish Army, Spanish Navy, Spanish Air Force, Common Corps and the Spanish Civil Guard, (the militarized police service depending on both Ministry of Interior and Ministry of Defense which holds different risponsabilities such Crime Investigation Department, Intelligence, Coast Guard , Fiscal and Borders responsibilities, Green Police, Public order and Security, Administrative Police, Traffic Police, Airborne Command, Scuba divers, weapons and firearms control etc among others) by their faultless and exemplary conduct in the service of The Crown."

The central medallion bears an effigy of St. Hermenegild on a horseback, surrounded by a blue ring inscribed "PREMIO A LA CONSTANCIA MILITAR" (reward for long military service).

The star has the form of a gold Maltese cross with ball finials and silver rays between the arms and the effigy of St. Hermenegild in the central medallion, surrounded by a white ring with the order's motto and a green laurel wreath.