Henry Baldwin Harshaw (June 14, 1842 – December 25, 1900) was an American lawyer and Republican politician.

He served in the famed Iron Brigade of the Army of the Potomac during the American Civil War and lost his left arm at the Battle of Chaffin's Farm.

While serving, he would be severely wounded and ultimately lose his left arm.

Harshaw died of tongue cancer in Milwaukee, Wisconsin on December 25, 1900.

Additionally, he was the postmaster of the Oshkosh post office and a circuit court clerk.