The Ontario Prader-Willi Syndrome Association (OPWSA) is a non-profit, charity which was established in 1982. Our mission is to enhance the quality of life for individuals with Prader-Willi Syndrome.

OPWSA has a membership of 1000, including individuals with PWS, their families and interested professionals.

This website was created to be a source of information for those interested in and affected by Prader-Willi Syndrome.

• Specific information on identifying the syndrome
• Get informed! Our publications page has some great new items
• Updated medical research, studies & other resources
• Let’s get together! Upcoming & past events!
• Discover the true face behind PWS
• Every little bit helps. Please help raise money for PWS
• Become a member today!