The Fazl Mosque (also known as the London Mosque) in London was inaugurated on October 23, 1926. It was the first Ahmadiyya mosque built in Britain and the first purpose built mosque in London. The majority of the money was contributed by Ahmadi women in India, who gave their jewellery and belongings to build the first purpose-built mosque in London.

The Fazl Mosque is located in Southfields, London near King George's Park and Southfields train station. The foundation stone was laid by Hazrat Mirza Basheer-ud-Din Mahmood Ahmad in 1924.

The mosque is the residence of the Ahmadiyya's Khalifatul Masih since April 1984. The mosque was the main venue for the Friday Sermon delivered by the Khalifa for many years until the completion of the Baitul Futuh mosque in 2003.

Fazl (Persian: فضل‎, also Romanized as Faz̤l) is a village in Darbqazi Rural District, in the Central District of Nishapur County, Razavi Khorasan Province, Iran. At the 2006 census, its population was 27, in 6 families.