Nadim Kassar is a Board Member of many financial institutions, philanthropic organizations among others:
- Nadim Kassar was officially nominated as Co-Chairman of Mastercard Middle East and Africa Advisory Board of Directors during the Mastercard Board meeting held in London in April 2019; recognizing Fransabank Group's commitment in playing a leading role in the Lebanese market and a being pioneer in promoting Mastercard products and latest technology.
- In 2025, Mr. Nadim was re-elected as Vice Chairman of the Association of Banks in Lebanon (ABL), a position he has held since 2019. He has been a board member of ABL since his appointment in 2001.
- Board Member of Net Commerce - a company providing a totally integrated E-Commerce solutions for Lebanon and the Middle East.
- Board Member of Interbank Payment Network (IPN) - a private company owned by the largest banks in Lebanon allowing cardholders to access a pool of shared Automatic Teller Machines (ATM) in Lebanon.
- Board Member of Credit Card Management (CCM) - a private company owned by the largest banks in Lebanon for managing the network of Point of Sales (POS) installed at merchant sites in Lebanon.
- China Arab Countries Interbank Association (CACIA) representing Fransabank SAL, founder member from 2018 till present.
- Board Member of the Lebanese International Finance Executives, LIFE - an international organization that brings together Lebanese talent in the financial industry around the world to channel the influence of Lebanese finance executives from 2009 to 2020.
- Council Member for the 2015 AUB Worldwide Alumni Association (WAAAUB), representing Lebanon.
- Founder, Board Member and General Secretary of the American Lebanese Chamber of Commerce Am Cham Lebanon - an NGO aiming at developing business and trade relations between Lebanon and the United States of America
- Member of the Russian-Lebanese Business Committee - a committee aims to promote development of bilateral commercial and economic relations between the Russian Federation and Lebanon.
- Member of the Board of Trustees of Makassed Philanthropic Islamic Association in Beirut from 2010 to 2018.
- Member of the Lebanese-Chinese Inter-Parliamentary Friendship Committee.
- Member of the Lebanese-Tunisian Friendship Committee.
- Treasurer of the Comité des Propriétaires-Ouyoun As Simane, Plateaux 2,3 & 4.
