John Hack (November 26, 1842 – March 29, 1933) was a decorated hero of the Union Army in the American Civil War.

According to the Military Times Hall of Valor, "on 3 May 1863, while serving with Company B, 47th Ohio Infantry, in action at Vicksburg, Mississippi.

Private Hack was one of a party which volunteered and attempted to run the enemy's batteries with a steam tug and two barges loaded with subsistence stores.

Place and date: At Vicksburg, MS., May 3, 1863 Citation: Was one of a party which volunteered and attempted to run the enemy's batteries with a steam tug and 2 barges loaded with subsistence stores.

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