21st Pennsylvania Infantry Regiment

21st Pennsylvania Volunteer Infantry
Pennsylvania flag
ActiveApril 20, 1861 – August 9, 1861
Country United States
AllegianceUnion
BranchUnited States Army
Union Army
TypeInfantry
Nickname(s)Philadelphia Light Guard
Commanders
ColonelJohn F. Ballier

The 21st Pennsylvania Volunteer Infantry was a three-month infantry regiment that served in the Union Army during the American Civil War.