The history of slavery covers slave systems in historical perspective in which one human being is legally the property of another, can be bought or sold, is not allowed to escape and must work for the owner without any choice involved. As Drescher (2009) argues, "The most crucial and frequently utilized aspect of the condition is a communally recognized right by some individuals to possess, buy, sell, discipline, transport, liberate, or otherwise dispose of the bodies and behavior of other individuals." An integral element is that children of a slave mother automatically become slaves. It does not include historical forced labor by prisoners, labor camps, or other forms of unfree labor in which laborers are not considered property.

Slavery can be traced back to the earliest records, such as the Code of Hammurabi (c. 1760 BC), which refers to it as an established institution. Slavery is rare among hunter-gatherer populations as slavery depends on a system of social stratification. Slavery typically also requires a shortage of labor and a surplus of land to be viable. David P. Forsythe wrote: "The fact remained that at the beginning of the nineteenth century an estimated three-quarters of all people alive were trapped in bondage against their will either in some form of slavery or serfdom."

Slavery is no longer legal anywhere in the world. Mauritania abolished it in law in 1981 and was the last country to do so – see Abolition of slavery timeline.