Major General Harry John Collins (December 7, 1895 – March 8, 1963) was a decorated senior United States Army officer who commanded the 42nd "Rainbow" Infantry Division during World War II.

He graduated from the Western Military Academy in 1915 and attended the University of Chicago before leaving in 1917 to join the United States Army after America's entry into World War I.

[2] Collins served with the 3rd Infantry on the Mexican Border at Eagle Pass, Texas, at the end of the Pancho Villa Expedition and during World War I.

As a senior commander, Collins earned the nickname "Hollywood Harry" for his flamboyant personal conduct, including use of a motorcycle escort with flashing lights and sirens when he traveled.

The 42nd Division, under Collins and aided by Brigadier General Henning Linden as his ADC, played a major role in stopping the last German drive into Western Europe, known as the Battle of the Bulge.

According to contemporary accounts, Collins was moved by the plight of the prisoners he saw at Dachau, and took extraordinary measures to ensure they immediately received housing, food and medical attention.

His example enabled Bohnen to successfully appeal for assistance from civilians in the United States, requesting items that the army was not prepared to supply, including kosher foods, religious articles and cash donations.

A year later he was appointed military attache in Moscow, afterwards returning to the United States to command the 31st Infantry Division at Camp Atterbury, Indiana.

[20] He retired from the army after 37 years in 1954 and worked as a vice president for North American Van Lines and a consultant to the Human Research Organization at George Washington University.