Iran and Saudi Arabia are engaged in an ongoing struggle for influence in the Middle East and other regions of the Muslim world. The two countries have provided varying degrees of support to opposing sides in nearby conflicts, including the civil wars in Syria and Yemen; and disputes in Bahrain, Lebanon, Qatar, and Iraq. The struggle also extends to disputes or broader competition in other countries globally including in West, North and East Africa, South, Central, Southeast Asia, the Balkans, and the Caucasus.

On 31 July 1987, during the Hajj pilgrimage in Mecca, a clash between Shia pilgrim demonstrators and the Saudi Arabian security forces resulted in the death of more than 400 people. The event has been variously described as a "riot" or a "massacre". It developed from increasing tensions between Shia Iran and Sunni Saudi Arabia since the 1979 Iranian Revolution. Since 1981, Iranian pilgrims have held a political demonstration against Israel and the United States every year at Hajj, but in 1987, a cordon of Saudi police and the Saudi Arabian National Guard sealed part of the planned demonstration route, resulting in a confrontation between them and the pilgrims. This escalated into a violent clash, followed by a deadly stampede.