This page offers many links to Canadian sites.

The National Associations for the Dually Diagnosed (NADD) - An Association for persons with a  developmental disability and a mental illness.

NADD Ontario Chapter

Developmental Disabilities Nursing Association

York University Dual Diagnosis Certificate

Brock University Dual Diagnosis Certificate

Ontario Association for Developmental Disabilities

Ontario Partnership on Aging and Developmental Disabilities 

National Organization for Rare Disorders