The Monarchy of Spain, constitutionally referred to as The Crown and commonly referred to as the Spanish monarchy or (historically) Hispanic Monarchy, is a constitutional institution and a historic office of Spain. The monarchy comprises a reigning King or Queen of Spain, their family, and the royal household organization which supports and facilitates the monarch in the exercise of his royal duties and prerogatives. The monarchy is currently represented by King Juan Carlos I, his wife Queen Sofia, and their children and grandchildren. Opinion polls routinely reveal that the monarchy remains popular by a wide majority of citizens in contemporary Spain, with as many as 75% of Spanish citizens ranking the monarchy above any other public institution in the country. In 2010, the budget for the Spanish monarchy was 7.4 million euros, one of the lowest public expenditures for the institution of monarchy in Europe.

The Spanish Constitution of 1978 reestablished a constitutional monarchy as the form of government for Spain. The 1978 constitution affirmed the role of the King of Spain as the personification and embodiment of the Spanish State and a symbol of Spain's enduring unity and permanence. Constitutionally, the king is the head-of-state and commander-in-chief of the Spanish Armed Forces. The constitution codifies the use of royal styles and titulary, royal prerogatives, hereditary succession to the crown, compensation, and a regency-guardianship contingency in cases of the monarch's minority or incapacitation. According to the constitution, the monarch is also instrumental in promoting Ibero-American relations, the "nations of its historical community". In this capacity, the King of Spain serves as the president of the Ibero-American States Organization, representing over 700,000,000 people in twenty-four member nations worldwide. In 2008, Juan Carlos I was considered the most popular leader in all Ibero-America.

Spain (ⁱ/ˈspeɪn/ SPAYN; Spanish: España, pronounced: [esˈpaɲa] ( listen)), officially the Kingdom of Spain (Spanish: Reino de España), is a sovereign state and a member of the European Union located in southwestern Europe on the Iberian Peninsula. Its mainland is bordered to the south and east by the Mediterranean Sea except for a small land boundary with the British Overseas Territory of Gibraltar; to the north and north east by France, Andorra, and the Bay of Biscay; and to the northwest and west by the Atlantic Ocean and Portugal.

Spanish territory also includes the Balearic Islands in the Mediterranean, the Canary Islands in the Atlantic Ocean off the African coast, and two autonomous cities in North Africa, Ceuta and Melilla, that border Morocco. Furthermore, the town of Llívia is a Spanish exclave situated inside French territory. With an area of 504,030 square kilometres (194,610 sq mi), it is the second largest country in Western Europe and the European Union after France, and the fourth largest country in Europe after Russia, Ukraine and France.