Organizations: O

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O'Neill's Dramatic Company

Oak Hall

Oak Tree Press

Oakham Grammar School

Oakland High School

Obelisk Press

Oberlin College

Oberlin College, Young Ladies Institution

Oberon Books

Oblates

Observer Books

Obstetrical Association of Midwives

Obstetrical Society

Obstetrical Society of London

Occupy

Ocean Accident and Guarantee Corporation Limited

OCLC

Octagon Theatre

October Club

Octopus Publishing Group

Oddfellows

Oddy and J. Goodwin

Odham Press

ODTAA

Office International d'Hygiène Publique

Office of Facts and Figures

Office of the United Nations High Commissioner for Refugees

Office of War Information

Office of Works, Edinburgh

Officer Cadet Training Unit

Official IRA

Ogilvy, Benson, and Mather

Ogwugwu Afor

Oireachtas

Ojai Festival

Old Bridewell Prison

Old Canterbury Arms

Old City Publishing

Old Fire Station Arts Centre

Old Fruitmarket

Old People's Welfare Association

Old Vic

Old Vic Company

Old Watercolour Society

Older Feminists Network

Oldham Repertory Company

Oldham's Companion Book Club

Oliphant, Anderson and Ferrier

Olive Schreiner Letters Project

Ollendorff