Holy Trinity Greek Orthodox Church, Surry Hills, Greek Orthodox church in Surry Hills, Australia

Holy Trinity Greek Orthodox Church is a heritage-listed church at 626–630 Bourke Street in Surry Hills, Sydney. Designed by C. R. Summerhayes and built by J. Noble between 1898 and 1931, it is also known as Ayia Trias and Agia Triada. The property belongs to the Greek Orthodox Community of NSW and was added to the New South Wales State Heritage Register on 28 May 2010.

The church's foundation was established in 1898, with cornerstone ceremonies deliberately timed to mark Constantinople's fall. This symbolic choice linked the new location in Australia to a pivotal moment in Byzantine history.

The church is also called Ayia Trias or Agia Triada, Greek for Holy Trinity. Its foundation date, 29 May, marks the fall of Constantinople in 1453, the day on which Holy Trinity churches are traditionally founded. The building belongs to the Greek Orthodox Community of NSW.

The church stands at 626–630 Bourke Street in Surry Hills, near the Redfern end of the street, in the City of Sydney. It is an active parish of the Greek Orthodox Community of NSW, so entry may be limited during services; visitors should dress modestly and keep voices low inside.

The foundation stones were laid on 29 May 1898, the date Constantinople fell to the Ottoman Turks in 1453; by tradition all Holy Trinity churches are founded on that day. The land was given by Ioannis Cominos and A£390 collected from the Orthodox community. The State Heritage Register listing came on 28 May 2010.