The American Association of Christian Schools (AACS) is an American fundamentalist organization based in Chattanooga, Tennessee, that unifies individual conservative Protestant schools and statewide Protestant school associations across the country for the purpose of accreditation, competition, and group benefits. Members subscribe to a Statement of Faith based on Biblical literalism, creationism, and a rejection of ecumenism.

State associations

The AACS includes 37 associations, each representing the AACS schools in its state.

Public policy advocacy

The AACS has an active lobbying program in Washington and sends periodic communications to its members providing news and recommended positions on current federal and state legislative proposals in the areas it describes as "education, religious liberty, pro-family, pro-gun and pro-life issues."

Land letter

In 2002, AACS president Carl D. Herbster was one of five evangelical Protestant leaders who signed the "Land letter" to President George W. Bush, outlining their theological support for a pre-emptive invasion of Iraq as a just war.