Associations, Admissions, and Affiliations partial list
- Chair-Elect, Family Law Executive Committee (FLEXCOM), Los Angeles County Bar Assoc. (2022)
- Fellow American Academy of Matrimonial Lawyers (2019)
- Fellow International Academy of Family Lawyers (2019)
- Officer (Secretary) Executive committee Member, State Bar of California, Family Law Section (2019)
- President, Southern California Family Law American Inn of Court (2019)
- Officer (Treasurer) Executive committee Member, State Bar of California, Family Law Section (2018)
- Vice President, Association of Certified Family Law Association-Charitable Foundation (2019)
- Member BOD, Association of Certified Family Law Association-Charitable Foundation (2018)
- President, Southern California Family Law American Inn of Court (2018)
- Vice-President, Southern California Family Law American Inn of Court (2017)
- Member Executive committee Member, State Bar of California, Family Law Section (2016-2017)
- Member Executive committee Member, State Bar of California, Family Law Section (2015-2016)
- Member Executive committee Member, State Bar of California, Family Law Section (2014-2015)
- President, Iranian American Lawyers Association (2012-2013)
- Executive Committee Member, Los Angeles County Bar Association, Family Law Section (2011 to present)
- Iranian American Lawyers Association, Chair MCLE (2011 to present)
- Association of Family and Conciliation Courts (2010)
- Association of Certified Family Law Specialists (2010 to present)
- Certified Family Law Specialist, Board of Legal Specialization, State Bar of California (2010 to present)
- Beverly Hills Bar Association, Chair-International Law committee(2010)
- United States Supreme Court (2001 to present)
- American Bar Association, Family Law Section (2000 to present)
- Family Section, State Bar of California (2000 to present)
- Iranian American Lawyers Association (2000 to present)
- United States District Court, California, Eastern District (1995 to present)
- United States District Court, California, Southern District (1994 to present)
- Los Angeles County Bar Association (1988 to present)
- Syndicate of Iranian Writers and Broadcasters, United States (1988)
- United States District Court, California, Central District (1988 to present)
- State Bar of California (1988 to present)
- State of California Supreme Court (1988 to present)
- Board of Directors, Syndicate of Iranian Journalists, Iran (1966)
Abbas Hadjian is an active member of numerous associations, and also holds the annual event Cultural Competency in Family Practice.