Gavison was a founding member of the Association for Civil Rights in Israel (ACRI), where she served for many years as Chairperson and as President from 1996 to 1999. Professor Gavison was a member of the International Commission of Jurists 1998-2008. In 2005 she founded Metzilah (Center of Zionist, Jewish, Liberal, and Humanistic Thought) and served as its chair and founding president.