The foreign ministers gathered in Saudi Arabia for a special session of the Organization of Islamic Cooperation to address the situation in Gaza. The OIC has 57 nations with largely Muslim populations.
They supported a plan to rebuild Gaza put forward by Egypt and backed by Arab states, including Saudi Arabia and Jordan.
Without mentioning Trump, the ministers' statement said that they rejected "plans aimed at displacing the Palestinian people individually or collectively ... as ethnic cleansing, a grave violation of international law and a crime against humanity."
They also condemned "policies of starvation" they said aim to push Palestinians to leave, a reference to Israel's cutting off all supplies to Gaza.
Trump has called for Gaza’s population to be resettled elsewhere permanently, so that the United States can take over the territory and develop it for others. Palestinians have rejected calls to leave.