Here you can find some useful links:

• Cyprus Mathematical Society, http://www.cms.org.cy
• Hellenic Mathematical Society, http://www.hms.gr
• Romanian Mathematical Society, http://rms.unibuc.ro/
• Bulgarian Mathematical Society, http://www.math.bas.bg/talents/
• Turkish Mathematical Society, http://www.tmd.org.tr/?lang=en
• Nesin Mathematics Village in Turkey, https://matematikkoyu.org/eng/ 

MASSEE Secretariat
34 Panepistimiou (Eleftheriou Venizelou) Street Athens 106 79 Hellas (Greece)
Telephone: +30 210 3616532
Facsimile: +30 210 3641025
Email of office: This email address is being protected from spambots. You need JavaScript enabled to view it. 

Official National Membership is limited to the region. Other membership is open as Associate Member.
There are two types of Associate membership: Institutional Associates and Individual Associates
From here, you can download the application form OR you can fill the online application form.

The Mathematical Society of South Eastern Europe (MASSEE) was established on 1st March 2003. The registered office of MASSEE is hosted by the Hellenic Mathematical Society in Athens, Greece at 34, Panepistimiou (Eleftheriou Venizelou) Street, GR. 106 79 – Athens, Greece. The main scope of the Association is to develop cooperation between and beyond the communities that are involved and further collaborate for adding value to the common activities organized in the area with main purpose the advancement of mathematics research and education.