| Official Name: | New Smithville, Pennsylvania |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Pennsylvania#USA |
| Pushpin Label: | New Smithville |
| Subdivision Type: | Country |
| Subdivision Name: |  United States |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Lehigh |
| Subdivision Type3: | Township |
| Subdivision Name3: | Weisenberg |
| Population Metro: | 865,310 (US: 68th) |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 554 |
| Coordinates: | 40.5797°N -75.7283°W |
| Postal Code Type: | ZIP Codes |
| Postal Code: | 18031, 19530 |
| Area Code: | 610 and 484 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 1204280 |
New Smithville is an unincorporated community in Weisenberg Township in Lehigh County, Pennsylvania, United States. It is located west of the city of Allentown and near the border with Berks County. It is part of the Lehigh Valley, which has a population of 861,899 and is the 68th-most populous metropolitan area in the U.S. as of the 2020 census.
It is located at the intersection of Pennsylvania Route 863 and Interstate 78/U.S. Route 22. It is split between the Breinigsville ZIP code of 18031 and the Kutztown ZIP code of 19530. It is in the Schuylkill watershed and is drained via the Mill Creek and Sacony Creek into the Maiden Creek. The New Smithville telephone exchange uses area code 610.