American Association on Intellectual and Developmental Disabilities

The American Association on Intellectual and Developmental Disabilities (AAIDD) (formerly the American Association on Mental Retardation (AAMR)) is an American non-profit professional organization that advocates on behalf of those with mental retardation. AAMR has members in the United States and 55 other countries.

Founded in 1876, the AAIDD is the oldest and largest interdisciplinary organization of professionals (and others) concerned about mental retardation and related disabilities.

The first meeting of the "Association of Medical Officers of American Institutions for Idiotic and Feebleminded Persons" was held at the Elwyn Training School in Elwyn, Pennsylvania. The organization later changed its name to "American Association on Mental Deficiency" (AAMD) and then to the "American Association on Mental Retardation." In June 2006, members of the association voted to change its name to the "American Association on Intellectual and Developmental Disabilities."