| Official Name: | East Carbon City, Utah |
| Other Name: | East Carbon-Sunnyside (2014-1016) |
| Settlement Type: | city |
| Image Map1: | Map of USA UT.svg |
| Map Caption1: | Location of Utah in the United States |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Utah |
| Subdivision Type2: | County |
| Subdivision Name2: | Carbon |
| Established Title: | Incorporated |
| Established Date: | January 1, 2014 |
| Unit Pref: | Imperial |
| Timezone: | Mountain (MST) |
| Utc Offset: | -7 |
| Timezone Dst: | MDT |
| Utc Offset Dst: | -6 |
| Elevation M: | 1825 |
| Elevation Ft: | 5987 |
| Coordinates: | 39.5425°N -110.4189°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 84520 |
| Postal2 Code Type: | ZIP code |
| Postal2 Code: | 84539 |
| Area Code: | 435 |
East Carbon City is a city in Carbon County, Utah, United States, that was incorporated on January 1, 2014 as East Carbon-Sunnyside, from the merger of the cities of East Carbon and Sunnyside. East Carbon-Sunnyside was a temporary name, to be used until the city council could adopt a permanent name.[1] As of January 1, 2016 the merged cities are officially known as East Carbon City, encompassing the subdivisions of Columbia, Dragerton and Sunnyside.
As of the 2010 census, East Carbon had a population of 1,301,[2] while Sunnyside had a population of 377,[3] for a combined population of 1,678. In 2018 East Carbon-Sunnyside had an estimated population of 1,475.