Second Battle of Charleston Harbor order of battle: Union

The following Union Army units and commanders fought in the Siege of Charleston Harbor of the American Civil War. The Confederate order of battle is listed separately.

The following lists contain the commanders and units involved in the operations against Charleston Harbor from July to September 1863 which included the major engagements of First Fort Wagner, Grimball's Landing, Second Fort Wagner and the Siege of Charleston Harbor.

Military ranks

 * MG = Major general
 * BG = Brigadier general
 * Col = Colonel
 * Ltc = Lieutenant colonel
 * Maj = Major
 * Cpt = Captain
 * Lt = 1st lieutenant

Other

 * w = wounded
 * mw = mortally wounded
 * k = killed

X Corps (Department of the South)
BG Quincy A. Gillmore

X Corps, Department of the South (July–August)
BG Quincy A. Gillmore
 * Chief of Staff and Artillery: Col John Wesley Turner
 * Engineers: Col Edward W. Serrell
 * Medical Director: Ltc Augustus C. Hamlin

X Corps, Department of the South (August–September)
MG Quincy A. Gillmore
 * Chief of Staff and Artillery: Col John Wesley Turner
 * Engineers: Col Edward W. Serrell
 * Medical Director: Ltc Augustus C. Hamlin

South Atlantic Blockading Squadron
Rear Admiral John A. Dahlgren