Daniel Chaplin (January 22, 1820 – August 20, 1864) was a Union army officer in the American Civil War.

When the Civil War broke out, he enlisted as a Private in Company F of the Second Maine Infantry Regiment, which was raised in Bangor.

In 1867 he was appointed a Brigadier General by Brevet in the Volunteer Army of the United States, for gallant and meritorious services at the Battle of Deep Bottom, Virginia, to date from 17 August 1864.

In the HISTORY OF THE FIRST MAINE HEAVY ARTILLERY appears this tribute to him: "He was born a soldier, attractive and magnetic in person, a fine horseman with commanding presence.

He gave to his officers a royal friendship, to his soldiers a fatherly care, and to all a considerate appreciation of merit, wherever found.