Full Members
- ASIM – Arbeitsgemeinschaft Simulation (Austria, Germany, Switzerland)
- CEA SMSG – Spanish Modelling and Simulation Group
- CROSSIM – Croatian Society for Simulation Modelling
- CSSS – Czech and Slovak Simulation Society
- DBSS – Dutch Benelux Simulation Society (Belgium, The Netherlands)
- KA-SIM – Kosova Society for Modeling and Simulation
- LIOPHANT SIMULATION – International Modelling and Simulation Group (Italy)
- LSS – Latvian Society for Simulation
- NSSM – National Society for Simulation Modelling in Russia
- PTSK – Polish Society for Computer Simulation
- SIMS – Simulation Society of Scandinavia (Denmark, Finland, Iceland, Norway, Sweden)
- SLOSIM – Slovenian Society for Simulation and Modelling
- UKSIM – United Kingdom Simulation Society (UK, Ireland)
Observer Members
- ALBSIM – Albanian Simulation Society
- ROMSIM – Romanian Society for Modelling and Simulation
Inactive Members
- FRANCOSIM – Société Francophone de Simulation (Belgium, France)
- HSS – Hungarian Simulation Society
- ISCS – Italian Society for Computer Simulation
