October 2011 (O-2011)

Office Of the Americas (OOA)

Older Women’s League (OWL)

Olive Tree Initiative (OTI)

Omnia Foundation (OF)

One Nation Working Together (ONWT)

One Voice International (OVI)

OneAmerica

Onward Together (OT)

Open Left (OL)

Open Society Foundations (OSF)

Oppressed of the Earth Organization (OEO)

Oregon Six (OS)

Organization of American Historians (OAH)

Organization of Jund al Haq (OJAH)

Organization of Solidarity of the Peoples of Africa, Asia and Latin America (OSPAAAL)

Organization of the Islamic Conference (OIC)

Organizations – Alphabetical – previous

Organizers’ Forum (OF)

Organizing For Action (OFA)

Organizing For America (OFA)

Our Revolution (OR)

Out of Iraq Congressional Caucus (OICC)

Overthrow.com (OT)

Oxfam International (OI)