Musayyib is an increasing majority Shia Arab town in the Babil Province, Iraq. As of 2018, its population was 57,300. Musayyib sits on both the east and west banks of the Euphrates River, which splits into the Hindiya and Hilla branches just south of the city. Musayyib's municipal government has heavy representation from the Office of the Martyr Sadr, the political wing of Moqtada Sadr's Militia. There is a small minority representation by the Badr Corps as well.