OAJ Trade Union of Education (OAJ)
Oakland University (OU)
Oak Ridge National Laboratory (ORNL)
Oarai Research and Development Center, Japan Atomic Energy Agency (JAEA)
Oberlin College
Ochanomizu University
Odense University Hospital (OUH)
Office of the Ombudsman for Children
Ohio University (OU)
Oikos Suomi ry
Oita University
Okan University
Okayama University
Okayama University of Science
Oklahoma State University
Okmetic Oy
Old Dominion University (ODU)
OLVI Foundation
Olympic Training Centre Freiburg-Schwarzwald
Om Biotechnologies
OMEGA - Centre de Microélectronique (OMEGA)
Omnia Espoon seudun koulutuskuntayhtymä Omnia
Onerva Mäen koulu
Ontario Institute for Cancer Research (OICR)
Ontario Osteoporosis Strategy