Kuwait sends first envoy to Iran in six years, Tehran announces
That came after Iranian protesters attacked Saudi diplomatic missions in Iran following Riyadh's execution of Shia Muslim cleric Nimr al-Nimr.
Badr Abdullah al-Munikh, Kuwait's new ambassador, has presented his letter of credence to Iranian Foreign Minister Hossein Amir-Abdollahian, the official IRNA news agency reported on Saturday night.
Saudi Arabia and Iran have had no diplomatic relations for six years, but have held talks, hosted by Iraq, since April last year in a bid to mend ties.
The UAE said in July it was "considering" appointing an ambassador to Tehran, which Iran said it expected "soon".
About one-third of Kuwait's local population belongs to the Shia branch of Islam, as do most Iranians.