| Official Name: | Lenni, Pennsylvania |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Pennsylvania |
| Pushpin Label: | Lenni |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Pennsylvania |
| Subdivision Type2: | County |
| Subdivision Name2: | Delaware |
| Subdivision Type3: | Township |
| Subdivision Name3: | Middletown |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 151 |
| Coordinates: | 39.8939°N -75.4478°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 19052 |
| Area Code: | 610 and 484 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 1179198 |
Lenni is an unincorporated community in Middletown Township in Delaware County, Pennsylvania, United States. Lenni is located at the intersection of Lenni Road and Lungren Road, northeast of the Chester Creek.[1]
On January 2, 1797, Thomas Griffith sold a tract of land to John Lungren, a paper manufacturer from Upper Providence, for the purposes of developing a mill which was built in 1798.
After 1877, the mills were leased to Union Army General Robert Patterson.[2]
The Lenni train station was closed in September 1986, due to deteriorating track conditions and Chester County's desire to expand facilities at Exton Station on SEPTA's Paoli/Thorndale Line.