Adoption law is the generic area of legal theory, policy making, legal practice and legal studies relating to law on adoption.

National, or domestic, adoption laws deal with issues such as step-parent adoption, adoption by cohabitees, adoption by single parents and LGBT adoption. Adoption laws in some countries may be affected by religious considerations such as adoption in Islam.

Laws vary widely from country to country and in the likes of United States, from state to state.

Intercountry adoption laws vary widely.