National Societies

Country Title Year Joined Web Site
Argentina SADIO 1962 www.sadio.org.ar
Australia ASOR 1960 www.asor.org.au
Austria ÖGOR 1979 www.oegor.at
Belarus BYORS 1998  
Belgium ORBEL/Sogesci-B.V.W.B. 1960 www.orbel.be
Brazil SOBRAPO 1969 www.sobrapo.org.br
Canada CORS/SCRO 1960 www.cors.ca
Chile ICHIO 1975  
China ORSC 1982 www.orsc.org.cn
Colombia ASOCIO 2016  http://asociocolombia.wixsite.com/asocio
Croatia CRORS 1994 http://www.hdoi.hr
Czech Republic CSOR 1994 http://csov.vse.cz
Denmark DORS 1963 www.dorsnet.dk
Estonia EstORS 2011 www.ioc.ee/matem/estors/index.html
Finland FORS 1975 www.operaatiotutkimus.fi
France ROADEF 1959 (founding member) www.roadef.org/
Germany GOR 1962 http://www.gor-ev.de/
Greece HELORS 1966 www.eeee.org.gr
Hong Kong ORSHK 1983  
Hungary HORS 1992 www.hors.hu/
Iceland ICORS 1986  
India ORSI 1960 www.orsi.in
Iran IORS 2009  
Ireland MSSI 1966 mis.ucd.ie/mssi
Israel ORSIS 1969 https://orsis.net.technion.ac.il/
Italy AIRO 1962 www.airo.org
Japan ORSJ 1961 www.orsj.or.jp/
Lithuania LITORS 2002 www.mii.lt/LitORS
Malaysia MSORSM 1988 http://www.msorsm.org/
Mexico SMIO 1966 http://www.smio.org.mx
Nepal ORSN 2011 http://orsn.org.np/
Netherlands NSOR 1960 www.ngb-online.nl
New Zealand ORSNZ 1970 www.orsnz.org.nz
Nigeria INFORN 2014 http://www.inforn.org.ng/ 
Norway NORS 1960  http://www.nors-online.no
Peru SOPIOS 2010 http://sopios.org/
Philippines ORSP 1990 www.orsp.org.ph
Poland ASPORS 1990 www.ptbois.org.pl
Portugal APDIO 1982 www.apdio.pt
Russia  RUORS 2016  http://ruors.ru
Serbia YUORS    
Singapore ORSS 1978  
Slovakia SSOR 1994  
Slovenia SDI-SOR 2007 http://www.drustvo-informatika.si/sekcije/sor/
South Korea KORS 1972 www.korms.or.kr
South Africa ORSSA 1973 www.orssa.org.za
Spain SEIO 1963 www.seio.es/
Sweden SOAF 1960 www.soaf.se
Switzerland SVOR 1963 www.svor.ch/
Tunisia TORS 2005 www.tors-tn.org
Turkey ORST 1977 www.yad.org.tr
United Kingdom ORS 1959 (founding member) www.theorsociety.com
United States of America INFORMS 1959 (founding member) www.informs.org
Uruguay AUDIIO 2009