| Official Name: | Old Union, Bowie County, Texas |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Texas#USA |
| Pushpin Label: | Old Union |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Texas |
| Subdivision Type2: | County |
| Subdivision Name2: | Bowie |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 322 |
| Coordinates: | 33.3425°N -94.4658°W |
| Area Code: | 903 & 430 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 1380897 |
Old Union is an unincorporated community in Bowie County, in the U.S. state of Texas. According to the Handbook of Texas, the community had a population of 238 in 2000. It is located within the Texarkana metropolitan area.
Old Union is located on U.S. Route 67, 9miles southwest of New Boston and 25miles southwest of Texarkana in southern Bowie County.[1]
A log schoolhouse was built around 1830.[1] Today, Old Union is served by the Simms Independent School District.