Finlaystone House is a mansion and estate in the Inverclyde council area and historic county of Renfrewshire.

It lies near the southern bank of the Firth of Clyde, beside the village of Langbank, in the west central Lowlands of Scotland.

[2] In the late 14th century, King Robert II confirmed a grant of the lands of Finlaystone to Sir John de Danyelstoun (Dennistoun).

[2] Kidston commissioned the architect John James Burnet to carry out a Scots Baronial style remodelling of the house, completed in 1903.

At present day, their son George Gordon MacMillan is the current chief and owner of Finlaystone, with his family running the estate.