Tronach Castle was a castle, about east of Portknockie, Moray, Scotland, near the shore.
The first Statistical Account of Scotland in the late 18th century reported that the ruins of a castle were to be seen. By the 1960s only the outline of a rectangular structure was visible on the flat summit of the rock; it is thought that this outline is that of the building mentioned. It was slightly raised above the level of the surrounding ground. There was no other evidence, and no visible stonework.[1]
The rectangular area measures by, and there are indications that other buildings may have existed towards the north-west. It is probable the entirety of the pinnacle would have been in use during its period of occupation.[2] The site was designated a scheduled monument in 2004.