Marquess of Powis was a title in the Peerage of England.

It was created in 1687 for William Herbert, 1st Earl of Powis.

When James II went into exile in France, the Marquess followed him.

The title of Baron Powis was created in the Peerage of England in 1629 for William Herbert.

Barbara, daughter of Lord Edward Herbert, younger son of the second Marquess of Powis and brother of the third Marquess, married Henry Arthur Herbert, who was created Earl of Powis in 1748.