The Preston Mosque, officially the Umar bin Al-Khattab Mosque, is a Sunni Islam mosque located in Preston, a suburb of Melbourne, in Victoria, Australia. The mosque is run by the (co-located) Islamic Society of Victoria Inc (ISV) and, between 2007 and 2011, was the seat of the late Muslim cleric, Sheik Fehmi Naji El-Imam, who was appointed as Grand Mufti of Australia.