Charles Wheaton Abbot Jr. (1860–1923) (sometimes misspelled as "Abbott") was an American military officer of the late 19th and early 20th centuries. He was commander of the 1st Rhode Island Volunteer Regiment during the Spanish–American War and served as Adjutant General of Rhode Island from 1911 until his death in 1923. He was also a veteran of the Indian Wars, Philippine Insurrection and the First World War.