The comments come amid growing concern over possible Israeli retaliation for last week's Iranian missile attack, as Iranian Foreign Minister Abbas Araqchi headed to Saudi Arabia and other Gulf states for talks on Wednesday.
They followed discussions between Iran and Gulf Arab capitals last week on the sidelines of an Asia conference in Doha, Qatar, when Gulf states sought to reassure Iran of their neutrality in any conflict between Tehran and Israel.
"Iran made it clear that any action by a Persian Gulf country against Tehran, whether through the use of airspace or military bases, will be regarded by Tehran as an action taken by the entire group, and Tehran will respond accordingly," a senior Iranian official told Reuters.
"The message emphasised the need for regional unity against Israel and the importance of securing stability.
"It also made clear that any assistance to Israel, such as allowing the use of a regional country's airspace for actions against Iran, is unacceptable."
US President Joe Biden is expected to hold a telephone call on Wednesday with Israeli Prime Minister Benjamin Netanyahu that will include discussion of any plans to strike Iran.
An official familiar with the matter said Iran did not discuss the issue of Gulf Arab oil producers raising output if Iranian production was disrupted during any escalation.
US news website Axios, citing Israeli officials, reported last week that Israel could target oil production facilities within Iran as retaliation.
Biden has said he would think about alternatives to striking Iranian oil fields if he were in Israel's shoes.
Any such attack would drive up global oil prices.
Iran has not threatened to attack Gulf oil facilities but has previously warned if "Israel supporters" intervened directly their interests in the region would be targeted.
Top oil exporter Saudi Arabia has had a political rapprochement with Tehran in recent years, which has helped ease regional tensions, but relations remain difficult.
Saudi Arabia has been wary of an Iranian strike on its oil facilities since a 2019 attack on its key refinery at Abqaiq briefly shut down more than five per cent of global oil supply.
Iran denied involvement.
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