The Mausoleum of Abdul-Qadir Gilani, also known as Al-Ḥaḍrat Al-Qādiriyyah or Mazār Ghous, is an Islamic religious complex dedicated to Abdul Qadir Gilani, the founder of the Qadiriyya Sufi order, located in Baghdad, Iraq. Its surrounding square is named Kilani Square. The complex consists of the mosque, mausoleum, and the library known as Qadiriyya Library, which houses rare old works related to Islamic Studies. The son of the entombed scholar, Abdul Razzaq Gilani, is also buried there.

Abdul Qadir Gilani was a Hanbali scholar, preacher, and Sufi leader who was the eponym of the Qadiriyya, one of the oldest Sufi orders.