There are a number of national and international Montessori organizations with varying membership, interests, and roles.
Teacher training organizations
Association Montessori Internationale (AMI)
The Association Montessori Internationale is an international organization founded in 1929 by Maria Montessori to promote and further her work. AMI offers teacher training and supports the natural development of children in teacher training programs, national affiliates, and special projects around the world. The U.S. affiliate is the Association Montessori Internationale—USA (AMI-USA).
American Montessori Society (AMS)
AMS was founded in 1960 and is now the largest Montessori organization in the U.S., training teachers and promoting Montessori education.
International Association of Progressive Montessorians (IAPM)
IAPM was founded in 1962 in London and continues to train teachers and affiliate schools.
Pan-American Montessori Society (PAMS)
PAMS was founded in 1973 and provides teacher training and school accreditation.
Montessori Educational Programs International (MEPI)
MEPI was founded in 1995 and offers teacher training and professional development.
Other Montessori Organizations
The National Center for Montessori in the Public Sector (NCMPS), which publishes MontessoriPublic, is an independent non-profit organization supporting the growth and development of high quality public Montessori programs. Read more about NCMPS
The North American Montessori Teachers’ Association (NAMTA) is a membership organization and AMI affiliate founded in 1970 promoting Montessori in North America. NAMTA offers national professional development events, a professional journal, and a number of other services and resources.
The Montessori Foundation is a nonprofit organization dedicated to the advancement of Montessori education. It sponsors a number of activities, including the periodical Tomorrow’s Child, a help line, a resource library, and a membership organization, the International Montessori Council (IMC).
The Montessori Accreditation Council for Teacher Education (MACTE) is the U.S. Department of education accreditation body for Montessori teacher training programs. The training organizations listed above are MACTE affiliates.