Royal warrants of appointment (Spanish: Proveedores de la Real Casa) have been issued for centuries to those who supplied goods or services to the Monarch of Spain.

The chosen establishments integrated a select list of purveyors throughout Spain that regularly sold its products to the royal house, considered always of high when not of splendid quality; perfumes, guns, rice or nougat, shoes, garments and even pianos.

In return, merchants, including some foreigners, were allowed to use the Spanish Crown shield in correspondence, labeling and invoices, as well as in the exterior signs of their businesses.

Inside those shops, some of them still decorated with prominent mahogany counters and gleaming showcases, a coveted parchment 60cm long and 40cm wide, written always in exquisite calligraphy and hung from the main wall; in it, the Head of the Royal Household testified that the owner of the commercial premises, "by order of the King", could be considered a Supplier of the Royal House, "for his intelligence and satisfaction."

Foreign purveyors include Cartier SA, Charvet Place Vendôme, Jacob & Josef Kohn, and Steinway & Sons.