The Baitul Futuh Mosque (English: House of Victories) has been deemed the largest mosque complex in Western Europe though according to some sources the Mosque of Rome is regarded the largest in Western Europe.^{[citation needed]}. Completed in 2003 at a cost of approximately £5.5 million, entirely from donations of the Ahmadiyya Muslim Community, the mosque covers an area of 5.2 acres (21,000 m²) and the full complex can accommodate up to 10,000 worshippers. It is located in the south-west London suburb of Morden, London Borough of Merton, next to Morden South railway station, approximately 700 yards from Morden Underground station.

The foundation stone was placed by Mirza Tahir Ahmad, the then head of the Ahmadiyya Muslim Community on 19 October 1999, in a ceremony attended by 2000 guests, and inaugurated by the current head of the Ahmadiyya Muslim Community, Mirza Masroor Ahmad, on 3 October 2003. Although based at Fazl Mosque, Mirza Masroor Ahmad delivers his weekly Friday Sermon from this mosque. The opening ceremony was attended by over 600 guests; those present included High Commissioners, Deputy High Commissioners, Members of European Parliament, Members of Parliament, Mayors of London boroughs, councillors, university lecturers, and representatives of 17 countries.