Florida (/ˈflɒrɪdə/ ⓘ FLORR-ih-də; Spanish: [floˈɾiða] ⓘ) is a state in the Southeastern region of the United States. It borders the Gulf of Mexico to the west, Alabama to the northwest, Georgia to the north, the Atlantic Ocean to the east, and the Straits of Florida and Cuba to the south. About two-thirds of Florida occupies a peninsula between the Gulf of Mexico and the Atlantic Ocean. It has the longest coastline in the contiguous United States, spanning approximately 1,350 miles (2,170 km), not including its many barrier islands. It is the only state that borders both the Gulf of Mexico and the Atlantic Ocean. With a population of over 23 million, it is the third-most populous state in the United States and ranks seventh in population density as of 2020. Florida spans 65,758 square miles (170,310 km2), ranking 22nd in area among the states. The Miami metropolitan area, anchored by the cities of Miami, Fort Lauderdale, and West Palm Beach, is the state's largest metropolitan area, with a population of 6.138 million; the most populous city is Jacksonville. Florida's other major population centers include Tampa Bay, Orlando, Cape Coral, and the state capital of Tallahassee.

Various Native American tribes have inhabited Florida for at least 14,000 years. In 1513, Spanish explorer Juan Ponce de León became the first known European to make landfall, calling the region La Florida (land of flowers) ([la floˈɾiða]). Florida subsequently became the first area in the continental U.S. to be permanently settled by Europeans, with the settlement of St. Augustine, founded in 1565, being the oldest continuously inhabited city. Florida was frequently attacked and coveted by Great Britain before Spain ceded it to the U.S. in 1819 in exchange for resolving the border dispute along the Sabine River in Spanish Texas. Florida was admitted as the 27th state on March 3, 1845, and was the principal location of the Seminole Wars (1816–1858), the longest and most extensive of the American Indian Wars. The state seceded from the Union on January 10, 1861, becoming one of the seven original Confederate States, and was readmitted to the Union after the Civil War on June 25, 1868.