| Official Name: | Newside, Pennsylvania |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Pennsylvania#USA |
| Pushpin Label: | Newside |
| Subdivision Type: | Country |
| Subdivision Name: |  United States |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Lehigh |
| Subdivision Type3: | Township |
| Subdivision Name3: | Heidelberg and Washington |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation M: | 184 |
| Elevation Ft: | 604 |
| Coordinates: | 40.6907°N -75.6444°W |
| Postal Code Type: | ZIP Code |
| Postal Code: | 18065 |
| Area Code: | 610 and 484 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 1182214 |
Newside is a small hamlet in Lehigh County, Pennsylvania, located four miles west of the town of Neffs, at the corner of Park Avenue and Newside Road. It is part of the Lehigh Valley metropolitan area.
Park Avenue is a major thoroughfare for citizens of the nearby communities, as it connects PA Route 873 with the outlying towns along the Blue Mountain. It also provides a route to the Appalachian Trail at Bake Oven Knob.
Washington Street parallels Park Avenue and PA Route 309. It is a very important local alternate to the latter for accessing the locales to the north.
Newside Road runs perpendicular from Park Avenue to 309.
Heidelberg Heights, the main residential subdivision in Newside, is home to an annual yard sale in September that attracts people of all ages from miles around.