He said the independent investigation would look into most serious cases where innocent people were killed.
The inquiry will also analyse the reported use of UN facilities by Palestinian militants to store weapons.
Some 2,100 Palestinians were killed in the conflict, along with 67 Israeli soldiers and six civilians in Israel.
The UN says that most of the Palestinian dead were civilians. Israel says the high civilian death toll was because of Hamas fighters launching attacks from residential areas, including schools and mosques, drawing return fire.
Israel launched the offensive in Gaza on 8 July, with the stated aim of stopping militants firing rockets and mortars at its territory.
Following several short-lived ceasefires, both sides agreed to an open-ended truce on 26 August which has so far held.
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