Charles Hazeltine Hammann (March 16, 1892 – June 14, 1919) was an officer in the United States Navy, an early naval aviator, and a recipient of the Medal of Honor.

He was awarded the Medal of Honor, when, as a pilot of a Macchi M.5 seaplane on August 21, 1918, off the Austro-Hungarian coast, he dived down and landed next to a downed fellow pilot, George M. Ludlow, and brought him aboard, and although his plane was not designed for the double load, brought him to safety amid constant danger of attack by Austrian planes.

The second was the USS Hammann (DE-131), an Edsall-class destroyer escort built for the United States Navy during World War II.

Hammann immediately dived down and landed on the water close alongside the disabled machine, where he took Ludlow on board.

Although his machine was not designed for the double load to which it was subjected, and although there was danger of attack by Austrian planes, he made his way to Porto Corsini.