Hacı Bayram Mosque is a historical mosque located in the Ulus district of Altındağ district of Ankara. It is adjacent to the Temple of Augustus. There is no information about the first architect of the mosque, Architect Mehmet Bey, whose construction date was 831 Hijri (1427-1428) as the first zawiya. Its current architectural structure dates back to the 17th century. and XVIII. It bears the characteristics of century mosques. The building has a longitudinal rectangular plan, a stone base, brick walls and a tile roof.

Hacı Bayram Mosque The mosque takes its name from the Hacı Bayram Tomb in its garden. The tomb adjacent to the mihrab wall was built in 1429. The tomb, which has a square plan and an octagonal drum, is covered with a lead dome. In the garden of the mosque there is also a 18th century monument. There is a tomb of Osman Fazıl Pasha dating back to the 19th century. The octagonal planned building is covered with a dome that rests directly on the walls. The sarcophagus of Osman Fazıl Pasha, which used to be in the tomb, was later taken to the family cemetery.[1] The mosque is a very rich structure in terms of wood, hand-carved decorations on wood and tile decorations. There are painted embroideries belonging to Nakkaş Mustafa Pasha on the wood inside the mosque.

There is a minaret with two balconies on the southeast wall of the mosque. This minaret has a square plan, a stone base and a cylindrical brick body. It was repaired in 1714 by Mehmet Baba, one of the grandchildren of Hacı Bayram Veli. The mosque and its complex, which was restored by the General Directorate of Foundations in 1940, were last renovated in accordance with the original under the leadership of Ankara Metropolitan Municipality and opened for worship as of February 14, 2011. The total capacity of four thousand five hundred people in the closed area and one thousand five hundred in the open area has been made suitable for six thousand people to worship.