Gül Baba (died 1541), also known as Jafer, was an Ottoman Bektashi dervish poet and companion of Sultan Suleiman I (r. 1520–1566) who took part in a number of campaigns in Europe from the reign of Mehmed II onwards.

Gül Baba is thought to have died in Buda during the first Muslim religious ceremony held after the Ottoman victory of 1541, or alternatively to have been killed during fighting below the walls of the city on August 21, 1541.

Gül Baba's octagonal tomb (türbe) is located on Mecset (mosque) Street, Budapest, a short but steep walk from the Margaret Bridge in the district of Rózsadomb.

The land later came under the ownership of János Wagner, who maintained the site and allowed access to Muslim pilgrims coming from the Ottoman Empire (see Islam in Hungary).

A large-scale renovation was completed in October 2018, when the site was inaugurated by Hungarian prime minister Viktor Orbán and Turkish president Recep Tayyip Erdoğan.