Ali Bitchin Mosque or Zawj Euyun Mosque is a historic mosque in Algiers, Algeria. Ali Bitchin ordered the construction of the mosque in 1622. it is situated inside the UNESCO World Heritage Site Casbah of Algiers. It's located at the crosspoint between the Bab al-Wadi Street and the lower area of casbah.

The Casbah is the citadel of Algiers in Algeria and the traditional quarter clustered around it. In 1992, the United Nations Educational, Scientific and Cultural Organization (UNESCO) proclaimed Kasbah of Algiers a World Cultural Heritage Site, as "There are the remains of the citadel, old mosques and Ottoman-style palaces as well as the remains of a traditional urban structure associated with a deep-rooted sense of community."