Organization Designation Authorization: An organization approved by the FAA (Federal Aviation Administration) for the approval of certification data in support of certificated aircraft, aircraft parts, and products.

Operational Detachment Alpha, standard 12-man team composed of US Army Special Forces operators

Civic Democratic Alliance (Czech: Občanská Demokratická Aliance)

Overseas Development Administration – predecessor to the United Kingdom Department for International Development

Olympic Delivery Authority

Organization for Democratic Action

Ontarians with Disabilities Act, provincial legislation for disabled persons

Ohio Dental Association

Oregon Department of Agriculture

Ontario Dental Association

Oda (disambiguation page)

Office of Degree Authorization– Oregon State

Open Design Alliance

Official Development Assistance– Development aid provided by the member states of DAC

Open Document Architecture, computer document standard created by the ITU-T

Official Development Assistance– Development aid provided by the member states of DAC

Open Document Architecture, computer document standard created by the ITU-T