Secretary of State Antony Blinken underlined the “deep commitment” of the US to Israel’s right to defend itself after holding talks with top officials in Tel Aviv.
In his second visit to Israel since the deadly attacks by Hamas, Mr Blinken met with Prime Minister Benjamin Netanyahu.
He reaffirmed US support and its willingness to aid the country, the State Department said.
More than 1,400 people were killed in Israel nine days ago.
Hamas militants crossed into Israel from the Gaza Strip to attack civilians and soldiers.
“You know our deep commitment to Israel’s right, indeed, its obligation to defend itself and to defend its people,” Mr Blinken said on Monday.
Israel has been bombing Gaza and is expected to launch a ground offensive into the territory after vowing to eliminate Hamas.
Appearing at a photo opportunity with Israel’s defence minister, Yoav Gallant, the top US diplomat added: “You always have the support of the United States.”
Mr Blinken also spoke to Mr Netanyahu about US coordination with the UN and regional partners for humanitarian aid, the State Department said.
Air sirens went off at one point during their meeting and Mr Blinken and Mr Netanyahu took shelter in a bunker for five minutes before resuming discussions at the defence ministry’s command centre, Reuters reported.
The visit comes as the humanitarian crisis in Gaza is reaching a critical point with water, food and medical supplies running low.
More than 2,700 Palestinians have been killed and 9,700 wounded in Gaza in Israel’s retaliatory strikes since the Hamas attacks.
At least 30 Americans are among the dead while 13 are still unaccounted for, according to the latest numbers from the US State Department.
The missing are thought to have been abducted by Hamas and Mr Blinken discussed with Mr Netanyahu how they might secure the release of nearly 200 people taken.
Hamas is a Palestinian militant group which has ruled the Gaza Strip since 2007. It is designated a terrorist organisation by the US and other western governments.
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