Charles Wheaton Abbot, Jr. (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.
Abbot was born in Warren, Rhode Island on July 8, 1860. He was the son of Rear Admiral Charles Wheaton Abbot, Sr., who had served as a pay director in the U.S. Navy during the American Civil War and Annie Frances Smith Abbot. He was also the grandson of Commodore Joel Abbot, a veteran of the War of 1812 who accompanied Commodore Matthew C. Perry on the expedition to open Japan in 1853. He was a descendant of Brigadier General Nathan Miller who was an officer in the Rhode Island Militia during the American Revolution.
In 1881 Abbot received a commission in the 12th Infantry as a 2nd lieutenant. Early in his career his postings were mostly in New York and in the Dakotas. He graduated the Infantry and Cavalry School at Fort Leavenworth, Kansas in 1883. On June 5, 1884 he married Marcia Ransom in Norwich, Connecticut. From 1889 to 1893 he served as the regimental adjutant for the 12th Infantry at Fort Yates in the Dakota Territory.
He was commissioned as colonel of the 1st Rhode Island Volunteer Infantry in May 1898. On June 9, 1898 the Board of Managers of the Rhode Island Society of the Sons of the American Revolution voted to present Colonel Abbot with a sword and belt. The regiment, nicknamed the "Rough Walkers", was posted in South Carolina and Virginia and was mustered out of service on March 30, 1899 without seeing overseas service.