Earl of Dumfries is a title in the Peerage of Scotland. It was originally created for William Crichton, 9th Lord Crichton of Sanquhar, in 1633, and stayed in the Crichton family until the death of the fourth countess in 1742, at which point the title passed to first the Dalrymple and then the MacDouall families before finally being inherited by the Marquesses of Bute, where it remains today.

Marquess of the County of Bute, shortened in general usage to Marquess of Bute, is a title in the Peerage of Great Britain. It was created in 1796 for John Stuart, 4th Earl of Bute.