Battle of Gettysburg order of battle: Union

The Union order of battle during the Battle of Gettysburg includes the American Civil War officers and men of the Army of the Potomac (multiple commander names indicate succession of command during the three-day battle (July 1–3, 1863)). Order of battle compiled from the army organization during the battle, the casualty returns and the reports.

Military rank

 * MG = Major General
 * BG = Brigadier General
 * Col = Colonel
 * Ltc = Lieutenant Colonel
 * Maj = Major
 * Cpt = Captain
 * Lt = Lieutenant
 * Sgt = Sergeant

Other

 * w = wounded
 * mw = mortally wounded
 * k = killed
 * c = captured
 * m = missing

Army of the Potomac
MG George G. Meade, Commanding

General Staff and Headquarters
General Staff:
 * Chief of Staff: MG Daniel Butterfield (w)
 * Assistant Adjutant General: BG Seth Williams
 * Assistant Inspector General: Col Edmund Schriver
 * Chief Quartermaster: BG Rufus Ingalls
 * Commissaries and subsistence: Col Henry F. Clarke
 * Chief of Artillery: BG Henry J. Hunt (w)
 * Chief Ordnance Officer: Cpt Daniel W. Flagler
 * Chief Signal Officer: Cpt Lemuel B. Norton
 * Medical Director: Maj Jonathan Letterman
 * Chief of Engineers: BG Gouverneur K. Warren (w)
 * Bureau of Military Information: Col George H. Sharpe

General Headquarters:

Command of the Provost Marshal General: BG Marsena R. Patrick
 * 93rd New York: Col John S. Crocker
 * 8th United States (8 companies): Cpt Edwin W. H. Read
 * 2nd Pennsylvania Cavalry: Col Richard Butler Price
 * 6th Pennsylvania Cavalry (Companies E & I): Cpt James Starr
 * Regular cavalry

Guards and Orderlies:
 * Oneida (New York) Cavalry: Cpt Daniel P. Mann

Engineer Brigade: BG Henry W. Benham
 * 15th New York Engineers (3 companies): Maj Walter L. Cassin
 * 50th New York Engineers: Col William H. Pettes
 * U.S. Battalion: Cpt George H. Mendell

I Corps
MG John F. Reynolds (k) MG Abner Doubleday MG John Newton General Headquarters:
 * 1st Maine Cavalry, Company L: Cpt Constantine Taylor

II Corps
MG Winfield S. Hancock (w) BG John Gibbon BG William Hays General Headquarters:
 * 6th New York Cavalry, Companies D and K: Cpt Riley Johnson (Escort)
 * 53rd Pennsylvania Infantry, Companies A, B and K: Maj Octavus Bull (Provost Marshal 2nd Corps)

III Corps
MG Daniel E. Sickles (w) MG David B. Birney (w)

V Corps
MG George Sykes

General Headquarters:
 * 12th New York Infantry (Companies D and E): Cpt Henry W. Ryder
 * 17th Pennsylvania Cavalry, Companies D and H: Cpt William Thompson

VI Corps
MG John Sedgwick

General Headquarters:
 * 1st New Jersey Cavalry, Company L and 1st Pennsylvania Cavalry, Company H: Cpt William S. Craft

XI Corps
MG Oliver O. Howard MG Carl Schurz

General Headquarters:
 * 1st Indiana Cavalry, Companies I and K: Cpt Abram Sharra
 * 8th New York Infantry (1 company): Lt Hermann Foerster

XII Corps
MG Henry W. Slocum BG Alpheus S. Williams

Provost Guard:
 * 10th Maine Battalion (3 companies): Cpt John D. Beardsley

Cavalry Corps
MG Alfred Pleasonton

Headquarter Guards:
 * 1st Ohio Cavalry, Company A: Cpt Noah Jones (Second Division)
 * 1st Ohio Cavalry, Company C: Cpt Samuel N. Stanford (Third Division)

Artillery Reserve
BG Robert O. Tyler Cpt James M. Robertson

Headquarter Guard:
 * 32nd Massachusetts Infantry, Company C: Cpt Josiah C. Fuller