Belém Tower, or Torre de Belém, is a 5-storey fortified lighthouse located in the Belém district of Lisbon, Portugal. It was constructed between 1515 and 1521 on the orders of Manuel I (1515-1520) in order to defend the port at Belém, as well as the nearby Mosteiro dos Jerónimos. The tower stood on an island in the middle of the River Tagus until the course of the river was diverted by an earthquake in 1777; the tower had previously survived the 1755 Lisbon earthquake.

The Torre de Belém was designed by Diogo and Francisco Arruda in the Manueline style - it is, in fact, Portugal's only example of a purely Manueline building