| Old Franklin County Jail | |
| Location: | NW corner of King and 2nd Sts., Chambersburg, Pennsylvania |
| Coordinates: | 39.9389°N -77.6597°W |
| Built: | 1818 |
| Architecture: | Georgian |
| Added: | January 21, 1970 |
| Area: | less than one acre |
| Refnum: | 70000549 |
| Designated Other1 Name: | Pennsylvania state historical marker |
| Designated Other1 Abbr: | PHMC |
| Designated Other1 Date: | May 9, 1975[1] |
| Designated Other1 Link: | List of Pennsylvania state historical markers |
| Designated Other1 Color: | navy |
| Designated Other1 Textcolor: |
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The Old Franklin County Jail is a historic jail located at Chambersburg in Franklin County, Pennsylvania. It was built in 1818, and is a two-story, brick building with a slate covered hipped roof topped by a cupola. The original building measures 84 feet wide by 48 feet deep. In 1880, a cell block was added. The jail yard is divided into two sections and surrounded by a 20-foot-high wall.[2] At least five prisoners were hanged on the premises.[3]
Now known as the Old Jail, the building houses a museum and genealogical library operated by the Franklin County Historical Society - Kittochtinny.
It was listed on the National Register of Historic Places in 1970. It is included in the Chambersburg Historic District.