Prior to the war, about 500 aid trucks a day were entering Gaza, said a spokesman from ActionAid Palestine.
A significant proportion of those living in the territory - some 1.2 million people - already relied on aid before the recent conflict erupted, according to the UN.
Israel is widely expected to launch a ground offensive into the Gaza Strip, but the timing remains unknown.
The Gaza Strip is a densely-populated enclave bounded by the Mediterranean Sea on one side and fenced off from Israel and Egypt.
Also on Saturday, leaders of the Arab world rejected the forced displacement of Palestinians into the Sinai peninsula.
Speaking at a summit in Cairo, Egypt’s President Abdel Fattah al-Sisi said the only solution was an independent state for Palestinians.
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