Tomb of the Unknown Soldier Centennial Commemorative Coin Act This bill directs the Department of the Treasury to mint and issue up to 100,000 $1 coins in commemoration of the centennial of the establishment of the Tomb of the Unknown Soldier. All sales of such coins shall include a surcharge of $10 for each coin. All surcharges received by Treasury from the sale of such coins must be paid to the National World War I Museum and Memorial to assist in the commemoration of the centennial.