The Battle of Altimarlach was a Scottish clan battle that took place on 13 July 1680, near Wick, Caithness, Scotland. It was fought in a dispute between Sir John Campbell of Glenorchy and George Sinclair of Keiss over who had the right to the title and lands of the Earl of Caithness. The battle was fought between men of the Clan Campbell and Clan Sinclair. Campbell of Glenorchy won a decisive victory in the battle, but Sinclair of Keiss later turned to the law and was awarded the title of Earl of Caithness.