Legitimacy, from the Latin legitimare meaning "to make lawful", may refer to:
- Legitimacy (criminal law)
- Legitimacy (family law)
- Legitimacy law in England and Wales, legitimacy (family law) in England and Wales
- Legitimacy (political)
See also
- Bastard (law of England and Wales)
- Illegitimacy in fiction
- Legit (disambiguation)
- Legitimate (professional wrestling)
- Legitimate expectation
- Legitimate peripheral participation
- Legitimate theater
- Legitimation
- Legitime
- Nomen illegitimum in botany is a valid published name that contravenes the international articles
- Sources of law