Allen County Jail | |
 Front of the jail | |
   | |
| Location | 204 N. Jefferson St., Iola, Kansas |
|---|---|
| Coordinates | 37°55′24″N 95°24′10″W / 37.92333°N 95.40278°W |
| Area | less than one acre |
| Built | 1869 |
| Architect | White & Hays |
| NRHP reference No. | 71000300[1] |
| Added to NRHP | January 25, 1971 |
The Old Allen County Jail is a former jail in Iola, Kansas, United States. Built in the late 1860s, it operated as a detention facility for nearly a century before a replacement opened; today, it is the Old Jail Museum, operated by the Allen County Historical Society, and it has been designated a historic site.