The Baitul Futuh is a mosque complex of the Ahmadiyya Muslim Community, situated in Morden, London. It is one of the largest mosque complexes in Europe. Completed in 2003 at a cost of £15 million, entirely from donations of Ahmadi Muslims, the Mosque can accommodate a total of 13,000 worshippers. The main mosque has a height of 23m above ground, and to maximise capacity the building extends below ground. Baitul Futuh is located in the south-west London suburb London Borough of Merton. It is situated next to Morden South railway station, 0.4 miles from Morden Underground station and one mile from Morden Road tram stop.

Ahmadiyya, officially the Ahmadiyya Muslim Jama'at (AMJ) is an Islamic messianic movement originating in British India in the late 19th century. It was founded by Mirza Ghulam Ahmad (1835–1908), who said he had been divinely appointed as both the Promised Mahdi and Messiah expected by Muslims to appear towards the end times and bring about, by peaceful means, the final triumph of Islam; as well as to embody, in this capacity, the expected eschatological figure of other major religious traditions. Adherents of the Ahmadiyya—a term adopted expressly in reference to Muhammad's alternative name Aḥmad—are known as Ahmadi Muslims or simply Ahmadis.