Saudi Arabia informed Iran's military attache, his assistant and three members of the embassy staff that they must leave the kingdom within 24 hours after being declared persona non grata, the Saudi foreign ministry said on Saturday, citing what it described as continued Iranian attacks on Saudi territory.
Saudi Arabia has come under attack by hundreds of Iranian missiles and drones since the start of US-Israeli war on Iran, the vast majority of which have been intercepted, authorities said.
The ministry said in a statement that continued Iranian attacks would lead to further escalation and have "significant consequences" for current and future relations.
On Wednesday, the Saudi foreign minister said the kingdom reserved the right to act militarily against Iran and any trust with Tehran had been shattered following recent attacks.
Saudi Arabia and Iran re-established diplomatic ties in 2023 as part of an effort to calm tensions after years of enmity that saw them back opposing political and military factions in the region.
The US-Israeli war on Iran and Tehran's subsequent attacks on Gulf neighbours have disrupted oil and natural gas exports from the Middle East and forced production stoppages.
US President Donald Trump and Iran threatened to escalate their war by attacking energy and desalination facilities in the Gulf, a potential widening of hostilities that could deepen a regional crisis and add to concerns in global markets.
An Israeli airstrike on a police vehicle on Sunday killed three people in the middle of the Nuseirat camp in the central Gaza Strip, health officials said, hours after another person was killed in a strike on northern Gaza.
The Strait of Hormuz remains open to all shipping except vessels linked to "Iran's enemies", Iran's representative to the UN maritime agency was quoted as saying in Iranian media reports published on Sunday.
The Gulf Cooperation Council (GCC) has renewed its condemnation of continued Iranian attacks on member states, including the targeting of infrastructure and oil facilities, in flagrant violation of international law and a direct threat to regional security, stability and the safety of global energy supplies.