Samuel Reeves Keesler, Jr. (April 11, 1896 – October 9, 1918) was a member of the United States Army Air Service in World War I posthumously awarded the Citation Star for gallantry.

He was commissioned in the Signal Officers' Reserve Corps on August 15, and he received training as an aerial observer at Post Field, Oklahoma, before sailing for France in March 1918.

After additional training in aerial gunnery and artillery fire control, Second Lieutenant Keesler was posted to the 24th Aero Squadron in the Verdun sector of the Western Front on August 26, 1918.

While performing a reconnaissance mission in the late afternoon of October 8, 1918, Keesler and his pilot, 1LT Harold W. Riley, were attacked by four enemy fighters.

Captured by German ground troops, the two airmen were unable to receive immediate medical attention, and Keesler died the following day.