The Imam Reza shrine, located in Mashhad, Iran, is an Islamic shrine containing the remains of Ali al-Rida, who is regarded as the eighth Imam in Shia Islam. Also contained within the complex are the Goharshad Mosque, a museum, a library, four seminaries, a cemetery, the Razavi University of Islamic Sciences, and other buildings.

The complex is a tourism center in Iran and has been described as "the heart of the Shia Iran" with 25 million Iranian and non-Iranian Shias visiting the shrine each year, according to a 2007 estimate.
The shrine itself covers an area of 267,079 square metres (2,874,810 sq ft) while the seven courtyards which surround it cover an area of 331,578 square metres (3,569,080 sq ft), totaling 598,657 m2 (6,443,890 sq ft).