Holy Trinity Church was established in 1896 on the site directly opposite the present building. In 1932, the present building was commenced, designed by renowned Australian Church architect, Louis Williams. It was completed in 1976 and consecrated by Archbishop Woods.

In 1957, after being administered by the Parish of Glenroy, the Parish became a separate entity. Work started on the St Oswald’s Church in Oak Park. That remained an active place of worship and education until closure in 2000.

In 1978, a Community Centre was built, replacing the old Church, which served as a Hall. In 2004-2006, a new ramp and restoration of the Holy Trinity buildings was undertaken.

The Church runs an active Op Shop in Cumberland Road, “Trinos Op Shop”.