The ΤCCI has co-signed Twinship Agreements with the following Chambers of Commerce and Industry:
 

• Marseilles (1976)
• Nicosia (1977)
• Trieste (1988)
• Budapest (1992)
• The Greek-Australian Chamber of South Australia (1997)
• The Greek-Canadian Chamber of Montreal (1996)
• Bursa (1999)

The TCCI has signed mutual collaboration and suppport Agreements with the following Chambers of Commerce and Industry:

• Melbourne (Australia)
• Russian Federation, in 1994
• Konstanza (Romania), in 1994
• Tirana (Albania), in 1998
• Santiago (Chile), in 1998
• Bucharest (Romania), in 1998
• Guanagxi (China), in 1999
• Moscow Region (Russia), in 2000
• Izmir (Turkey), in 2000
• Sfax (Tunesia), in 2001
• St Petersburg (Russia), in 2002
• Dnipropetrovsk (Ukraine), in 2002
• Valencia (Spain), 2004
• Alexandria (Egypt), 2005
• China Council for the Promotion of International Trade (CCPIT), in Beijing, (China), 2005
• Chamber of International Commerce Shanghai (China), 2005
• China Council for the Promotion of International Trade, Anshan Branch (China), 2005
• Lahore (Pakistan), in 2006
• Beirut (Lebanon), in 2006
• Bucharest (Romania), under the new legal form, in 2006, www.ccib.ro
• Regional Chamber of Economy of Nis, Serbia, in 2007
• Belarus (Belarus), in 2008
• Moldova (Republic of Moldova), in 2008
• Istanbul (Turkey), in 2008
• Zawia (Libya), in 2009
• Οdessa (Ukraine), in 2009
• Kherson (Ukraine), in 2009
• American-Hellenic Chamber of Commerce, in 2009
• Hellenic-Russian Chamber of Commerce, 2011
• Greek-Turkish Chamber of Northern Greece, 2011
• Tirana (Albania), 2011
• El- Behira (Egypt), 2012
• Bucharest (Romania), in replacement of former agreement, 2017
• Samarkand Territorial Department of Chamber of Commerce and Industry of Uzbekistan, 2018

Furthermore the TCCI:

• was appointed Honorary Member of the Association for Friendship and Cooperation between Greece and Azerbaijan, 2013
• co-signed a Collaboration Agreement with Neapolis University Pafos, 2022

For the development of international collaborations, for the benefit of the business community, the TCCI – indicatively – participates in European programs and in collaboration with foreign bodies implements projects, is represented in official state missions abroad, welcomes foreign missions, official and entrepreneurial and organizes informative events and private meetings between Greek and foreign entrepreneurs of respective interest.