Horatio Gates Gibson (May 22, 1827 – April 18, 1924) was a career artillery officer in the United States Army, and colonel in the American Civil War.

Born in Baltimore, Maryland, Gibson attended the United States Military Academy at West Point, New York, and graduated seventeenth in the Class of 1847.

Commissioned into the 3rd Regiment of Artillery, he rose slowly through the peacetime army, eventually earning his captaincy at the outbreak of the Civil War.

Following an act of Congress on April 23, 1904, Gibson was promoted one grade from colonel to the rank of brigadier general on the retired list, due to his service in the Civil War and more than forty years in the United States Army.

When he was a lieutenant at the battle of Fredericksburg, his sword was cut from his side by a shell; at the end of the Civil War he was a captain in the regulars.