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Unfree labour is a generic or collective term for those work relations, especially in modern or early modern history, in which people are employed against their will by the threat of destitution, detention, violence (including death), lawful compulsion, or other extreme hardship to themselves or to members of their families.

Unfree labour includes all forms of slavery, and related institutions (e.g. debt slavery, serfdom, corvée and labour camps). Many of these forms of work may be covered by the term forced labour, which is defined by the International Labour Organization (ILO) as all involuntary work or service exacted under the menace of a penalty.