The Dominican Republic is a country in the Caribbean located on the island of Hispaniola in the Greater Antilles of the Caribbean Sea in the North Atlantic Ocean. It shares a maritime border with Puerto Rico to the east and a land border with Haiti to the west, occupying the eastern five-eighths of Hispaniola which, along with Saint Martin, is one of only two islands in the Caribbean shared by two sovereign states. In the Antilles, the country is the second-largest nation by area after Cuba at 48,671 square kilometers (18,792 sq mi) and second-largest by population after Haiti with approximately 11.4 million people in 2024, of whom 3.6 million reside in the metropolitan area of Santo Domingo, the capital city.

The native Taíno people had inhabited Hispaniola prior to European contact, dividing it into five chiefdoms. Christopher Columbus claimed the island for Castile, landing there on his first voyage in 1492. The colony of Santo Domingo became the site of the first permanent European settlement in the Americas. In 1697, Spain recognized French dominion over the western third of the island, which became the independent First Empire of Haiti in 1804. A group of Dominicans deposed the Spanish governor and declared independence from Spain in November 1821, but were annexed by Haiti in February 1822. Independence came 22 years later in 1844, after victory in the Dominican War of Independence. The next 72 years saw several civil wars, failed invasions by Haiti, and a brief return to Spanish colonial status, before permanently ousting the Spanish during the Dominican Restoration War of 1863–1865. From 1930, the dictatorship of Rafael Trujillo ruled until his assassination in 1961. Juan Bosch was elected president in 1962 but was deposed in a military coup in 1963. The Dominican Civil War of 1965 preceded the authoritarian rule of Joaquín Balaguer (1966–1978 and 1986–1996). Since 1978, the Dominican Republic has moved towards representative democracy.

The Dominican Republic has the largest economy in the Caribbean and the seventh-largest in Latin America. Over the last 25 years, the Dominican Republic has had the fastest-growing economy in the Western Hemisphere – with an average real GDP growth rate of 5.3% between 1992 and 2018. GDP growth in 2014 and 2015 reached 7.3 and 7.0%, respectively, the highest in the Western Hemisphere. Recent growth has been driven by construction, manufacturing, tourism, and mining. The country is the site of the third largest (in terms of production) gold mine in the world, the Pueblo Viejo mine. The gold production of the country was 31 metric tonnes in 2015.

The Dominican Republic is the most visited destination in the Caribbean. A geographically diverse nation, the Dominican Republic is home to both the Caribbean's tallest mountain peak, Pico Duarte, and the Caribbean's largest lake and lowest point, Lake Enriquillo. The island has an average temperature of 26 °C (78.8 °F) and great climatic and biological diversity. The country is also the site of the first cathedral, palace, monastery, and fortress built in the Americas, located in Santo Domingo's Colonial Zone, a World Heritage Site.

The name Dominican originates from Saint Dominic, the patron saint of astronomers, and founder of the Dominican Order. The Dominican Order established what is now known as the Universidad Autónoma de Santo Domingo, the first university in the New World.

For most of its history, up until independence, the colony was known simply as Santo Domingo and continued to be commonly known as such in English until the early 20th century. The residents were called "Dominicans" (Dominicanos), the adjectival form of "Domingo", and as such, the revolutionaries named their newly independent country the "Dominican Republic" (la República Dominicana).

In the national anthem of the Dominican Republic (himno nacional de la República Dominicana), the poetic term "Quisqueyans" (Quisqueyanos) is used instead of "Dominicans". The word "Quisqueya" derives from the Ciguayo language, and means "mother of the lands". It is often used in songs as another name for the country. The name of the country in English is often shortened to "the D.R." (la R.D.), but this is rare in Spanish.

The islands of the Caribbean were first settled around 6,000 years ago by hunter-gatherer peoples originating from Central America or northern South America. The Arawakan-speaking ancestors of the Taíno moved into the Caribbean from South America during the 1st millennium BCE, reaching Hispaniola by around 600 CE. These Arawakan peoples engaged in farming, fishing, hunting and gathering, and the widespread production of ceramic goods.