Canadian Operational Research Society/Société Canadienne de Recherche Opérationnelle - Bulletin, meetings, careers, membership information and other resources. French and English site.

ROADEF - French OR society.

Netherlands Society for Statistics and Operational Research - VVS: Vereniging voor Statistiek en Operationele Research / Netherlands Society for Statistics and Operations Research.

Operational Research Society - United Kingdom OR society.

Gesellschaft für Operations Research e. V. - German OR society.

Management Science Society of Ireland Home Page - The Management Science Society of Ireland promotes, in the Irish business environment, a scientific approach to problem-solving in support of management decision-making.

Hungarian Operations Research Society - Publications, meetings, jobs and other resources.

AIRO - Italian OR society.

ASRO/SVOR - Homepage of the Swiss Operations Research Society (ASRO/SVOR).

S.E.I.O. - Spanish OR society.

SOAF - Swedish OR society.

ORSSA - South African OR society.

Dansk Selskab for Operationsanalyse - Danish OR society.

OEGOR - Austrian OR society.

Suomen Operaatiotutkimusseura ry - Finnish OR society.

SOGESCI-BVWB - Belgian OR society.

Aðgerðarannsóknafélag Íslands - Icelandic Operations Research Society (ICORS).

Operational Research Society of Singapore - Membership, meetings, jobs, resources.

Australian Society for Operations Research (ASOR) - Membership, meetings, resources.

Operational Research Society of Italy (AIRO) - Membership, meetings, publications.

Operational Research Society of New Zealand - Membership, meetings, resources.

Operations Research Society of the Philippines - Activities, officers and members, the ORSP-Corps, and links to related OR sites.

Asia-Pacific Journal of Operational Research - The official journal of the Association of Asian-Pacific Operational Research Societies within IFORS (APORS).