The Hadum Mosque (Albanian: Xhamia e Hadumit; Turkish: Hadım Camisi) in Gjakova, Kosovo was built in the last decade of the 16th century (1594/95) and was financed by Hadum Sylejman Efendia – Hadum Aga, which explains the name of the mosque. The mosque was built on the property of Jakë Vula and is located in the Old Bazaar. Evliya Çelebi said that around the plain of Jak Vula and Hadum Mosque were 2000 houses, some masjid and two monumental mosques, inns covered in lead, a beautiful hamam and 300 shops.

A rectangular, dome-covered structure, it belongs to the classic forms of mosque of the Islamic-Kosovar style. Around the mosque there are tombs with sculpted decorations and engraved with epithets in the old Ottoman language. The tombs belonged to the most respected families in Gjakova. There also used to be a "hamam", but it was destroyed during World War II. The entrances are covered with floral paintings, geometrical shapes, citations from the Kur'an and arabesques. In 1999, the surrounding complex was burned to the ground and only the mosque and the minaret along with some damaged arabesques survived.