Mount Breckan is a grand 38-room residence, originally located on 160 acres (65 ha) in the south-coast town of Victor Harbor, South Australia.

[1][2] The house was one of the largest residences in Australia at that time, with a floor area of 19,000 square feet (1,800 m2), sixty rooms, two cellars and a five-storey tower.

It was commissioned by Alexander Hay, a prominent politician, farmer, and wealthy Rundle Street merchant, and cost £25,000 to build.

In 1908 the house was destroyed by fire; due to inadequate insurance coverage, the Hay family did not rebuild the ruin.

Later the Commonwealth Government bought the house for use as a rehabilitation and training facility for the Royal Australian Air Force.