Observatory
Organization established in order to study phenomena, events, humans and their activities and elicit remarks and reflections concerning them.
OCA
Observatoire de la Côte d'Azur (Observatory of the Côte d'Azur)
OELR
Office de l'eau de La Réunion (Water office of La Reunion)
ONERC
Observatoire National sur les Effets du Réchauffment Climatique (National observatory of the effects of global warming).
OPECST
Office parlementaire d'évaluation des choix scientifiques et technologiques (Parliamentary office for the evaluation of scientific and technological choices).