Islam in Australia is a minority religious affiliation. According to the 2011 census, 476,291 people, or 2.2% of the total Australian population, were Muslims. This made Islam the fourth largest religious grouping, after all forms of Christianity (61.1%), irreligion (22.9%), and Buddhism (2.5%). Demographers attribute Muslim community growth trends during the most recent census period to relatively high birth rates, and recent immigration patterns. Adherents of Islam represent the majority of the population in Cocos (Keeling) Islands. The vast majority of Muslims in Australia belong to the Sunni denomination, with a sizeable Shia minority.
While the Australian Muslim community is defined largely by religious belonging, it is fragmented racially, ethnically, culturally and linguistically. Members of the Australian Muslim community thus also espouse parallel non-religious ethnic identities with related non-Muslim counterparts, either within Australia or abroad.