Slavery in Florida occurred among Indigenous tribes and during Spanish and British rule. Florida's purchase by the United States from Spain in 1819 (effective 1821) was primarily a measure to strengthen the system of slavery on Southern plantations, by denying potential runaways the formerly safe haven of Florida. Florida became a slave state, seceded, and passed laws to exile or enslave free blacks. Even after abolition, forced labor continued.

Few enslaved Africans were imported into Florida from Cuba in the period of Spanish colonial rule, as there was little for them to do—no mines, no plantations. Starting in 1687, slaves escaping from English colonies to the north were freed when they reached Florida and accepted Catholic baptism. Black slavery in the region was widely established after Florida came under British then American control. Slavery in Florida was theoretically abolished by the 1863 Emancipation Proclamation issued by President Lincoln, though as the state was then part of the Confederacy this had little immediate effect.

Slavery in Florida did not end abruptly on one specific day. As news arrived of the end of the Civil War and the collapse of the Confederacy in the spring of 1865, slavery unofficially ended, as there were no more slave catchers or other authority to enforce the peculiar institution. Newly emancipated African Americans departed their plantations, often in search of relatives who were separated from their family. The end of slavery was made formal by the ratification of the Thirteenth Amendment in December 1865. Some of the characteristics of slavery, such as inability to leave an abusive situation, continued under sharecropping, convict leasing, and vagrancy laws. In the 20th and 21st centuries, conditions approximating slavery are found among marginal immigrant populations, especially migrant farm workers and trafficked sex workers. The Florida Slavery Memorial is planned.

Slavery before arrival of the Europeans Enslavement predates the period of European colonization and was practiced by various Indigenous peoples. Florida had some of the first African slaves in what is now the United States in 1526, as well as the first emancipation of escaping slaves in 1687 and the first settlement of free blacks in 1735.

Spanish era

Exploration era (1513–1526) The first European known to have explored the coasts of Florida was the Spanish explorer and governor of Puerto Rico, Juan Ponce de León, who likely ventured in 1513 as far north as the vicinity of the future St. Augustine, naming the peninsula he believed to be an island "La Florida" and claiming it for the Spanish Crown. It is likely that slaves were included in the voyage, but they were not recorded.

First Spanish occupation (1536–1763)

In 1528, a slave named Estevanico ("Little Steven") was brought to the area as part of the Narváez expedition, which then continued on to Texas. More African slaves arrived in Florida in 1539 with Hernando de Soto.

When the Spaniards founded the colonial settlement of San Agustín in 1565, the site already had enslaved Native Americans, whose ancestors had migrated from Cuba. The Spaniards did not bring many slaves to Florida as there was no work for them to do—no mines and no plantations. For the same reason very few Spaniards came to Florida; there were only three towns in the colony, supporting military/naval outposts: St. Augustine, St. Marks, and what is today Pensacola. Under Spanish colonial rule, the enslaved in Florida had rights. They could marry, own property, and purchase their own freedom. Free blacks, as long as they were Catholic, were not subject to legal discrimination. No one was born into slavery. Mixed "race" marriages were not illegal, and mixed "race" children could inherit property.

In October 1687, eleven enslaved Africans made their way from Carolina to Florida in a stolen canoe, and were emancipated by the Spanish authorities. A year later, Major William Dunlop, an officer in the Carolina militia, arrived in Florida to ask for compensation for Spanish attacks on Carolina and the return of the Africans to their enslaver, Governor Joseph Morton. The Spanish chose to compensate Morton instead, submitting a report to King Charles II on the event. On November 7, 1693, Charles II issued a decree freeing all slaves escaping from English North America who accepted Catholicism, similar to the May 29, 1680 Spanish decree for slaves escaping from the Lesser Antilles and the September 3, 1680, and June 1, 1685, decrees for escaping French slaves.

In the early 1700s, Spanish Florida was a hotbed for the raiding Native Americans from the northern Carolina and Georgia areas. Though they were left alone for the most part by one of the original raiding groups, the Westos, Spanish Florida was heavily targeted by the later raiding groups, the Yamasee and Creek. These raids, in which villages were destroyed and local Native Americans were either killed or captured to be later sold as slaves to English colonists, drove the local Native Americans to the hands of the Spanish, who attempted to protect them as best they could from the raids. However, the strength of the Spanish dwindled and as the raids continued the Spanish and Spanish-allied natives were forced to retreat farther and farther back into the peninsula. The raids were so frequent that there were few natives left to capture, and so the Yamasee and the Creek began bringing fewer and fewer slaves to the Carolina colonies and were unable to effectively continue the trade. The retreat of the Spanish was only ended when the Yamasee and Creek entered what would later be known as the Yamasee War with the Carolina colony.Ethridge, Robbie Franklyn, and Sheri Marie Shuck-Hall. 2009. Mapping the Mississippian Shatter Zone: The Colonial Indian Slave Trade and Regional Instability in the American South. U of Nebraska Press.

Since 1688, Spanish Florida had attracted numerous fugitive slaves who escaped from the British North American colonies. Once the slaves reached Florida, the Spanish freed them if they converted to Roman Catholicism; males of age had to complete a military obligation. Many settled in Gracia Real de Santa Teresa de Mose, the first settlement of free blacks in North America, near St. Augustine. The church started recording baptisms and deaths there in 1735, and a fort was built in 1738, part of the perimeter defenses of San Agustin. The freed slaves knew the border areas well and led military raids, under their own black officers, against the Carolinas, and against Georgia, founded in 1731. Another smaller group settled along the Apalachicola River in remote northwest Florida, centered on Prospect Bluff, future site of the famous Negro Fort.

British Florida (1763–1783)

In 1763, Great Britain took over Florida in an exchange with Spain after defeating France in the Seven Years' War. Spain evacuated its citizens from St. Augustine, including the residents of Fort Mose, transporting them to Cuba. As British colonists developed the colony for plantation agriculture, the percentage of slaves in the population in twenty years rose from 18% to almost 65% by 1783."Plantations", Florida Memory

Second Spanish occupation (1783–1821) Former slaves also found refuge among the Creek and Seminole, Native Americans who had established settlements in Florida at the invitation of the Spanish government. In 1771, Governor John Moultrie wrote to the Board of Trade that "It has been a practice for a good while past, for negroes to run away from their Masters, and get into the Indian towns, from whence it proved very difficult to get them back." When British colonial officials in Florida pressured the Native Americans to return the fugitive slaves, they replied that they had "merely given hungry people food, and invited the slaveholders to catch the runaways themselves."Miller, E: "St. Augustine's British Years," The Journal of the St. Augustine Historical Society, 2001, p. 38.

After the American Revolution, slaves from the State of Georgia and the South Carolina Low Country continued to escape to Florida. By 1814, the black population, both free and enslaved, of Florida had risen to 57%, compared to 27% in 1786. The U.S. Army led increasingly frequent incursions into Spanish territory, including the 1817–1818 campaign by Andrew Jackson that became known as the First Seminole War. The United States afterwards effectively controlled East Florida. According to Secretary of State John Quincy Adams, the US had to take action there because Florida had become "a derelict open to the occupancy of every enemy, civilized or savage, of the United States, and serving no other earthly purpose than as a post of annoyance to them."Alexander Deconde, A History of American Foreign Policy (1963) p. 127 Spain requested British intervention, but London declined to assist Spain in the negotiations. Some of President James Monroe's cabinet demanded Jackson's immediate dismissal, but Adams realized that it put the U.S. in a favorable diplomatic position, allowing him to negotiate very favorable terms.Weeks (2002)

The Spaniards had established outposts in Florida to prevent others from having safe ports to attack Spanish treasure fleets in the Caribbean and in the strait between Florida and the Bahamas. Florida did not produce anything the Spaniards wanted. The three garrisons were a financial drain, and it was not felt desirable to send settlers or additional garrisons. The Crown decided to cede the territory to the United States. It accomplished this through the Adams–Onís Treaty of 1819, which took effect in 1821.

Treatment of Blacks under Spanish rule Under the Spaniards, enslaved workers had rights: to marry, to own property, to buy their own freedom. They were not chattel. Free Blacks, as long as they accepted Catholicism, were not subject to legal discrimination. No one was born into slavery. Mixed "race" marriages were not illegal, and mixed "race" children could inherit property, as later Zephaniah Kingsley's inheritors had to fight successfully for.

Zephaniah Kingsley

During the second Spanish period, when slaves continued to escape from their British, then American owners and take refuge in Florida, the North American slave trade was to a large extent centered on Florida. Besides those seeking to recover escaped slaves, the newly enslaved could be freely imported to Florida from Africa, and planters and their representatives went to Florida to buy them and then smuggle them into the U.S.

At the center of Florida's slave trade was the colorful trader and slavery defender, Quaker Zephaniah Kingsley, owner of slaving vessels (boats). He treated his enslaved well, allowed them to save for and buy their freedom (at a 50% discount), and taught them crafts like carpentry, for which reason his highly-trained, well-behaved slaves sold for a premium. After Florida became American, Kingsley, after trying unsuccessfully to prevent Florida from treating free Blacks as unwelcome (see below), left for what at the time was Haiti (today the Dominican Republic).

Territorial Florida, under American rule (1821–1845)

Florida became an organized territory of the United States on February 22, 1821. (See Adams–Onís Treaty.) Slavery continued to be permitted; however, Spanish racial policies were replaced with a rigid set of laws that assumed that all Black persons, slave or free, were uncivilized and inferior to whites, and suitable only for slavery.