Balloch Castle is an early 19th-century country house situated at the southern tip of Loch Lomond, in West Dunbartonshire, Scotland.

In the 19th century the estate was purchased by John Buchanan of Ardoch, who demolished the ruins of the old castle and erected the present building.

Balloch Castle is a category A listed building, and the estate is included on the Inventory of Gardens and Designed Landscapes in Scotland.

[6][7][8] The architect of the Tudor Gothic building was London-based Robert Lugar, who had designed the nearby Tullichewan Castle in 1792.

Although an unimaginative designer, at Balloch Lugar helped to introduce the asymmetrical, "picturesque" form of castellated house into Scotland.

[12] The latter passed through several owners in the 19th century, including Mr Gibson Stott, who made further improvements to the parks, and the Denniston-Brown family.

[11] The house has periodically been used to provide visitor facilities and offices, with past occupants including the Nature Conservancy Council and the local Countryside Ranger Service.

[14] The castle grounds feature two main pleasure gardens, one to the north of the house including rhododendrons and azaleas that reach full bloom in late May and early June.

[5] In 2001, a £2.3-million programme of works sought to restore the castle grounds, including the reopening of lost views and improved woodland management.