Habsburg Spain refers to Spain and the Spanish Empire, also known as the Catholic Monarchy, in the period from 1516 to 1700 when it was ruled by kings from the House of Habsburg. It had territories around the world, including modern-day Spain, a piece of south-eastern France, eventually Portugal and many other lands outside the Iberian Peninsula, like in the Americas. Habsburg Spain was a composite monarchy and a personal union. The Habsburg Spanish monarchs of this period are chiefly Charles I, Philip II, Philip III, Philip IV and Charles II. In this period the Spanish empire was at the zenith of its influence and power. Spain, or "the Spains", referring to Spanish territories across different continents in this period, initially covered the entire Iberian peninsula, including the crowns of Castile, Aragon and from 1580 Portugal. It then expanded to include territories over the five continents, consisting of much of the American continent and islands thereof, the West Indies in the Americas, the Low Countries, Belgium, Luxembourg, Italian territories and France in Europe, Portuguese possessions such as small enclaves like Ceuta and Oran in North Africa, and the Philippines and other possessions in Southeast Asia. The period of Spanish history has also been referred to as the "Age of Expansion".

The Spanish Empire, sometimes referred to as the Hispanic Monarchy or the Catholic Monarchy, was a colonial empire that existed between 1492 and 1976. In conjunction with the Portuguese Empire, it ushered in the European Age of Discovery. It achieved a global scale, controlling vast portions of the Americas, Africa, various islands in Asia and Oceania, as well as territory in other parts of Europe. It was one of the most powerful empires of the early modern period, becoming known as "the empire on which the sun never sets". At its greatest extent in the late 1700s and early 1800s, the Spanish Empire covered over 13 million square kilometres, making it one of the largest empires in history.