The Grand Mosque of the Sultan of Riau or also called the Sultan of Riau Mosque is one of the old and historic mosques in Indonesia which is located on Penyengat Island, Tanjungpinang City, Riau Islands province. This mosque is a unique mosque because one of the building material mixtures used is egg white. The Sultan of Riau Mosque has been made a cultural heritage site by the government of the Republic of Indonesia.
