| Official Name: | Lanark, Texas |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Texas#USA |
| Pushpin Label: | Lanark |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Texas |
| Subdivision Type2: | County |
| Subdivision Name2: | Cass |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 331 |
| Coordinates: | 33.1819°N -94.1494°W |
| Area Code: | 903 & 430 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 1378556 |
Lanark is an unincorporated community in Cass County, Texas, United States. According to the Handbook of Texas, the community had a population of 30 in 2000.
Lanark was first settled in the early 1870s when the Texas and Pacific Railway passed through the town. A post office existed from 1873 to 1877. It is reported that there were difficulties in developing land grants in the area, resulting in some residents relocating to either Queen City or Atlanta. Lanark only consisted of a few scattered houses in 1983. In 2000, the population was 30.
Lanark is located on U.S. Highway 59, 2miles north of Queen City in northeastern Cass County.
Lanark is served by the Queen City Independent School District.