Legal Definition of Guardian: A person who has been given the legal right and duty to take care of another individual and/or that individual’s property. Guardianships are granted when a person does not have certain legal rights, such as a minor, to take care of himself and his affairs, or a mentally ill or debilitated person not being capable of managing himself and his affairs | Discover the legal definition and importance of guardianship. Learn how guardians protect the rights and well-being of individuals unable to care for themselves. Examples of guardianship scenarios included. Click to learn more