William Baillie (1723–1810) often known as "Captain William Baillie" was an Irish printmaker, known especially for works in the style of, or directly copied from, the etchings of Rembrandt. Usually described as an amateur artist, he was an officer in the British Army until 1761, and later held the post of Commissioner of Stamps. He also acted as an agent for art collectors, most notably Lord Bute.