Isadore Siegfried Jachman (December 14, 1922 – January 4, 1945) was a United States Army staff sergeant who was killed in World War II after defending the town of Flamierge in Belgium from a German attack on January 4, 1945, for which he received the Medal of Honor.

Sergeant Jachman left his place of cover, dashed across open ground, through a hail of fire and grabbed a bazooka from a fallen comrade.

For conspicuous gallantry and intrepidity above and beyond the call of duty at Flamierge, Belgium, on 4 January 1945, when his company was pinned down by enemy artillery, mortar, and small arms fire, 2 hostile tanks attacked the unit, inflicting heavy.

Jachman, seeing the desperate plight of his comrades, left his place of cover and with total disregard for his own safety dashed across open ground through a hail of fire and seizing a bazooka from a fallen comrade advanced on the tanks, which concentrated their fire on him.

Jachman's heroic action, in which he suffered fatal wounds, disrupted the entire enemy attack, reflecting the highest credit upon himself and the parachute infantry.