Sir Ralph Abercromby KB (sometimes spelt Abercrombie) (October 7, 1734 – March 28, 1801) is a Scottish soldier and politician.

He rises to the rank of lieutenant-general in the British Army, is noted for his services during the Napoleonic Wars, and serves as Commander-in-Chief, Ireland.

He twice serves as MP for Clackmannanshire, and he is appointed Governor of Trinidad.