Herman Henry Hanneken (June 23, 1893 – August 23, 1986) was a United States Marine Corps officer and a recipient of the U.S. military's highest decoration, the Medal of Honor.

Hanneken was awarded the Medal of Honor for "extraordinary heroism" and "conspicuous gallantry and intrepidity in actual conflict with the enemy" and, in December 1919, commissioned as a second lieutenant.

The unit returned to Quantico in the latter part of 1922, and several months later, he was transferred to the Marine Detachment, USS Antares, where he assumed duties as commanding officer.

He was next ordered to New York to assume command of the Marine detachment aboard the USS Harry Lee with additional duties as Transport Quartermaster.

Hanneken served with the 1st Marine Division from June 1941 until November 1944, when he returned to the United States to command the 2nd Infantry Training Regiment and the Headquarters Battalion, at Camp Pendleton, Oceanside, California.

While commander of the 2nd Battalion of 7th Marine Regiment during the Guadalcanal campaign he was awarded the Silver Star for conspicuous gallantry and intrepidity in action against the enemy.

Second Lieutenant Hanneken not only distinguished himself by his excellent judgement and leadership, but unhesitatingly exposed himself to great personal danger, and the slightest error would have forfeited not only his life but the lives of the detachments of Gendarmerie under his command.

The successful termination of his mission will undoubtedly prove of untold value to the Republic of Haiti.Citation: The President of the United States of America takes pleasure in presenting the Navy Cross to First Lieutenant Herman Henry Hanneken (MCSN: 0-392), United States Marine Corps, for extraordinary heroism displayed on the night of March 31 - 1 April 1920, by advancing into the camp of Osiris Joseph, a notorious bandit leader, while serving with the First Provisional Brigade of Marines (Gendarmerie d'Haiti).

With admirable disregard of danger, Lieutenant Hanneken, leading a small detail, advanced to within about fifteen feet of Osiris Joseph, who was surrounded by his followers, shot and killed him, thereby ridding the country of a bandit who had long terrorized Northern Haiti.

[1]Citation: The President of the United States of America takes pleasure in presenting a Gold Star in lieu of a Second Award of the Navy Cross to First Lieutenant Herman Henry Hanneken (MCSN: 0-392), United States Marine Corps, for extraordinary achievement, zeal untiring and most successful efforts during active service in the Northern Area of the Republic of Nicaragua from 11 December 1928 until 30 June 1929.

In command of a combined Marine and Nicaraguan Voluntario combat patrol, First Lieutenant Hanneken had many successful contacts with the bandits during which he distinguished himself by his gallantry.

After Lieutenant Colonel Hanneken had brought his battalion into a position on the beach east of Metapona River, an out-numbering hostile force affected a landing near his flank and succeeded in establishing a beachhead for future operations.