Shiloh National Military Park Boundary Adjustment and Parker's Crossroads Battlefield Designation Act - Modifies the boundary of Shiloh National Military Park to include the following areas : (1) Fallen Timbers Battlefield, (2) Russell House Battlefield, and (3) Davis Bridge Battlefield. Authorizes the Secretary of the Interior to acquire lands by donation, purchase from willing sellers, or exchange.
Establishes Parker's Crossroads Battlefield in Tennessee as an affiliated area of the National Park System.