Innisfallen Castle and grounds is a heritage-listed mansion located at 14 Cherry Place, Castle Cove, City of Willoughby, New South Wales, Australia. The castle is situated on a point overlooking Sugarloaf Bay in the Middle Harbour of Sydney.

The property is privately owned. It was added to the New South Wales State Heritage Register on 2 April 1999.

This section needs expansion. You can help by adding to it. (August 2018)

The mansion was built by Henry Hastings Willis, a former Member and Speaker of the Parliament of New South Wales, as a home for his family. Construction began in 1903 and was completed in 1905. Originally, the area surrounding the castle was 55 acres.

The castle was built from local sandstone in the late English Gothic style. Access to the castle was originally via rowing boat and a rough bush track. A wharf was later added.

The castle has nine major rooms, with numerous small rooms including a large reception room, drawing room, dining room, four main bedrooms, staff quarters, and a large basement.

The house was named in honour of a ruined abbey at Killarney, Ireland.

Innisfallen Castle and Grounds was listed on the New South Wales State Heritage Register on 2 April 1999.

• Australian residential architectural styles

This Wikipedia article was originally based on Innisfallen Castle and Grounds, entry number 00404 in the New South Wales State Heritage Register published by the State of New South Wales (Department of Planning and Environment) 2018 under CC-BY 4.0 licence, accessed on 1 June 2018.

Media related to Innisfallen Castle at Wikimedia Commons