| Unit Name: | 128th Pennsylvania Volunteer Infantry |
| Dates: | August 14, 1862 to May 19, 1863 |
| Country: | United States |
| Allegiance: | Union |
| Branch: | Infantry |
| Battles: | Battle of Antietam Battle of Chancellorsville |
The 128th Pennsylvania Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War.
The 128th Pennsylvania Infantry was organized at Camp Curtin near Harrisburg, Pennsylvania, and mustered in August 14, 1862 under the command of Colonel Samuel Croasdale.
The regiment was attached to 1st Brigade, 1st Division, XII Corps, Army of the Potomac.
The 128th Pennsylvania Infantry mustered out May 19, 1863.
Left Pennsylvania for Washington, D.C., August 16, and duty there until September 6. Moved to Frederick, Md., September 6–14. Battle of Antietam, Md., September 16–17. At Sandy Hook and Maryland Heights September 22 to December 10. Moved to Fairfax Station, Va., December 10–14. Duty there until January 19, 1863. Moved to Stafford Court House January 19–23, and duty there until April 27. Chancellorsville Campaign April 27 – May 6. Battle of Chancellorsville May 1–5.
The regiment lost a total of 59 men during service; 2 officers and 31 enlisted men killed or mortally wounded, 26 enlisted men died of disease. More than half the regiment was surrounded and captured at the Battle of Chancellorsville (9 officers and 225 men).