In family law and public policy, child support (or child maintenance) is an ongoing, periodic payment made by a parent for the financial benefit of a child following the end of a marriage or other relationship. Child maintenance is paid directly or indirectly by an obligor to an obligee for the care and support of children of a relationship that has been terminated, or in some cases never existed. Often the obligor is a non-custodial parent. The obligee is typically a custodial parent, a caregiver, a guardian, or the state.

Depending on the jurisdiction, a custodial parent may pay child support to a non-custodial parent. Typically one has the same duty to pay child support irrespective of sex, so a mother is required to pay support to a father just as a father must pay a mother. Where there is joint custody, the child is considered to have two custodial parents and no non-custodial parents, and a custodial parent with a higher income (obligor) may be required to pay the other custodial parent (obligee).

The right to child support and the responsibilities of parents to provide such support have been internationally recognized. The 1992 United Nations Convention on the Rights of the Child is a binding convention signed by every member nation of the United Nations and formally ratified by all but South Sudan and the United States. It declares that the upbringing and development of children and a standard of living adequate for the children's development is a common responsibility of both parents and a fundamental human right for children, and asserts that the primary responsibility to provide such for the children rests with their parents.Other United Nations documents and decisions related to child support enforcement include the 1956 New York Convention on the Recovery Abroad of Maintenance created under the auspices of the United Nations, which has been ratified by the 64 of the UN member state.