| Official Name: | New Boston, New Hampshire |
| Settlement Type: | Census-designated place |
| Pushpin Map: | New Hampshire#USA |
| Pushpin Label: | New Boston |
| Pushpin Label Position: | bottom |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | New Hampshire |
| Subdivision Type2: | County |
| Subdivision Name2: | Hillsborough |
| Subdivision Type3: | Town |
| Subdivision Name3: | New Boston |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 1.38 |
| Area Land Km2: | 1.34 |
| Area Water Km2: | 0.04 |
| Area Total Sq Mi: | 0.53 |
| Area Land Sq Mi: | 0.52 |
| Area Water Sq Mi: | 0.02 |
| Population As Of: | 2020 |
| Population Total: | 326 |
| Population Density Km2: | 243.96 |
| Population Density Sq Mi: | 631.78 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 489 |
| Coordinates: | 42.9758°N -71.6931°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 03070 |
| Area Code: | 603 |
| Blank Name: | FIPS code |
| Blank Info: | 33-50660 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2806681 |
New Boston is a census-designated place (CDP) comprising the main village in the town of New Boston, Hillsborough County, New Hampshire, United States. As of the 2020 census, the population of the CDP was 326,[2] out of 6,108 in the entire town.
The CDP is in the center of the town of New Boston, on both sides of the South Branch Piscataquog River. The CDP extends west past Briar Hill Road, south down Route 13 to its crossing of the South Branch, east to Molly Stark Lane and Hilldale Lane, and north up Route 136 to Beard Road.[3]
New Hampshire Route 13 passes through the center of the community, leaving to the northeast down the South Branch valley along River Road, and leaving to the south along Mont Vernon Road. Route 13 leads northeast 7miles to Goffstown and south 11miles to Milford. New Hampshire Route 136 has its eastern terminus at Route 13 and leads west 7miles to Francestown, while New Hampshire Route 77 has it southern terminus at the same junction with NH 13 but leads north 9miles to Weare.
According to the U.S. Census Bureau, the New Boston CDP has a total area of 1.4sqkm, of which 0.04sqkm, or 3.22%, are water.[4] Via the South Branch of the Piscataquog, New Boston is part of the Merrimack River watershed.