Organizations
- Civic Democratic Alliance (Czech: Občanská Demokratická Aliance), small political party in the Czech Republic, functional between 1989 and 2007
- Offa's Dyke Association, organization that promotes the Offa's Dyke Path in Wales
- Ohio Dental Association
- Olympic Delivery Authority, London-based quango
- Ontario Dental Association
- Organization for Democratic Action (Arabic: حزب دعم العمالي; Hebrew: דעם מפלגת פועלים), political party in Israel, commonly known locally by the acronym Da'am
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