Manumission, from manumit /ˌmænjəˈmɪt/, is the act of a slave owner freeing his or her slaves. Different approaches developed, each specific to the time and place of a society's slave system.

The motivations of slave owners in manumitting slaves were complex and varied. Firstly, manumission may present itself as a sentimental and benevolent gesture. One typical scenario was the freeing in the master's will of a devoted servant after long years of service. A trusted bailiff might be manumitted as a gesture of gratitude; for those working as agricultural laborers or in workshops, there was little likelihood of being so noticed.