Hasan Abdulhadi Ali was sentenced to death by the lower and appeals courts last year after he was convicted of being "the mastermind of a cell" of 26 Shiites accused of links to Iran and of plotting attacks in the Sunni-ruled emirate.
Members of the cell had been charged with spying for Iran and hiding large quantities of arms, explosives and ammunition in underground warehouses.
Ali was also found guilty of having been an operative of Lebanon's Shiite Hezbollah movement since 1996 and of smuggling significant amounts of arms and explosives from Iran into Kuwait.
The cases of the remaining three members were not taken up by the supreme court because they remain fugitives.
They include the only Iranian member of the cell, Abdulredha Haider, who was handed the death penalty in absentia by the lower court in January last year.
The court had accused Haider of ties to Iran's elite Revolutionary Guard and of recruiting the Kuwaiti Shiites and facilitating their travel to Lebanon, where they received military training from Iran-backed Hezbollah.
Iran has denied any links to the group.
Around a third of Kuwait's native population of 1.35 million is Shiite.
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