The formal name for the Preston Mosque is Umar bin Al-Khattab, and the mosque is run by the (co-located) Islamic Society of Victoria Inc (ISV). It was the seat of the late Muslim cleric, Sheikh Fehmi Naji El-Imam, who was appointed as Grand Mufti of Australia from 2007 to 2011. Before the mosque was built, Muslims would gather at a house that used to be on the property. In 1975 the building began and was completed the following year in 1976. The dome and minaret were added later. Most of it was funded by Bosnian Muslims and Arabs.
About 800 people pass through the mosque per day over the course of the five daily prayers. For the Friday Congregational Prayer, at least 1000 worshipers will attend, and if the Friday falls on a public holiday that number can easily climb to 1500 worshipers. ISV offer religious and social welfare services while leading ongoing collaborations between other organations, community groups, council and govermnment. They also facilitate state and national initiatives on cohesion and harmony, with an aim in advancing interfaith and intercultural civic participation and engagement. It has experience in building meaningful relationships, partnerships and projects with Muslim and non-Muslim organisations, and various cultural diversity groups.