Assistant Professor David Landy, from Academia for Palestine, says a student encampment and pressure from staff encouraged the college to review its ties.
The board of Trinity College has decided to divest from Israel.
It means the university will cut "institutional links with the State of Israel, Israeli universities and companies headquartered in Israel".
The board says the measure will continue for "the duration of ongoing violations of international and humanitarian law".
Assistant Professor David Landy, from Academia for Palestine, says a student encampment and pressure from staff encouraged the college to review its ties.

Daniel Kinahan Set To Apply For Bail
Former Swimming Coach George Gibney Jailed For Over 15 Years For Sexual Abuse Of Children
Robert Pether Returning To Ireland After Five-Year Iraqi Detention
Over 23,000 Teachers Beginning Industrial Action Today
New Funding Announced For Youth Services And Counselling In Kildare On World Mental Health Day
Jury In Triple Murder Trial Of Louth Family Sent Home
Appointment Cancellations Expected As Strikes To Take Place Next Week
Families Face Delays Arranging Funerals Amid Pressure On Post-Mortem Services