AATB, American Association of Tissue Banks, is a non-profit association of organizations and individuals who are involved in activities related to transplantation of cells and tissues. They were founded in 1976 and are headquartered in McLean, Virginia. Like the AABB, they maintain a voluntary accreditation program.

In the United States, for purely historical reasons, human blood and human tissue are regulated differently. The relevant accreditation for cord blood banks is AABB or FACT. The laboratory of a cord blood bank may also hold AATB accreditation if they are also engaged in tissue banking. For example, sperm banking is considered tissue banking and is eligible for AATB accreditation.