William Schabas, who currently works as an international law professor at Middlesex University in England, will be chairing the three-member commission of inquiry.
Senegalese lawyer Doudou Diene, who has filled UN posts on racism and human rights in Ivory Coast, is also a member of the commission.
Schabas has previously served as one of three international members of the Sierra Leone Truth and Reconciliation Commission and has been a consultant on capital punishment for the United Nations Office of Drugs and Crime.
The appointments for the new commission were announced Monday by Gabon Ambassador Baudelaire Ndong Ella, who is president of the 47-nation UN Human Rights Council.
The month-long war between the Israeli military and rocket-firing Hamas militants in Gaza, has killed more than 1,900 Palestinians, the majority civilians, according to Palestinian and UN officials.
In Israel, officials say 67 people have been killed, all but three of them soldiers.