Justin is a city in Denton County, Texas, United States with some of it rolling over into Wise County, TX. The population was 3,246 at the 2010 census.
In 1848, approximately 70 followers of the French utopian socialist Étienne Cabet arrived in what is now Justin to found an Icariancommunity. The attempt failed. Contrary to popular belief, the town is not named after or related to the Justin Boot Company (although the company operates a large outlet store in the city). In January 1887 the community petitioned postal authorities for a post office to be named Justin, in honor of Justin Sherman, a chief engineer with the Santa Fe Railroad.