Isaac Robert Cruikshank (September 27, 1789 - March 13, 1856) was an artist who was the less well-known brother of artist George Cruikshank. Both brothers were interested in the theatre and performed in dramas which they had written with Edmund Kean, an English actor regarded the greatest actor of his day. He joined the Loyal North Britons, a volunteer military unit, rising to the rank of sergeant. Cruikshank gained a midshipman's commission with the East India Company on their ship Perseverance, yet he did not get on with the captain and was deliberately left behind on St. Helena when attempting to return upon his maiden voyage.
In the late 1820s Cruikshank illustrated a number of notable books.