| Official Name: | Mashantucket, Connecticut |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Connecticut#USA |
| Pushpin Label: | Mashantucket |
| Coordinates: | 41.4625°N -71.9772°W |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Name1: | Connecticut |
| Subdivision Type2: | County |
| Subdivision Name2: | New London |
| Subdivision Type3: | Town |
| Subdivision Name3: | Ledyard |
| Area Footnotes: | [1] |
| Area Total Km2: | 6.61 |
| Area Land Km2: | 6.61 |
| Area Water Km2: | 0.0 |
| Population As Of: | 2010 |
| Population Footnotes: | [2] |
| Population Total: | 299 |
| Population Density Km2: | 45.2 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 140 |
| Postal Code Type: | ZIP Code |
| Postal Code: | 06338 (Mashantucket) |
| Area Code: | 860/959 |
| Blank Name: | FIPS code |
| Blank Info: | 09-15840 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2633319 |
Mashantucket is a census-designated place (CDP) in the northeast part of the town of Ledyard, New London County, Connecticut, United States. It consists of land held by the Mashantucket Pequot Tribe. The Foxwoods Resort Casino is in the northeast part of the CDP, along Connecticut Route 2. As of the 2010 census, the CDP had a population of 299.[2]