| Official Name: | McMahan, Texas |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Texas#USA |
| Pushpin Label: | McMahan |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Texas |
| Subdivision Type2: | County |
| Subdivision Name2: | Caldwell |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 443 |
| Coordinates: | 29.8528°N -97.5194°W |
| Area Code: | 512 & 737 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 1341260 |
McMahan is an unincorporated community in Caldwell County, in the U.S. state of Texas. According to the Handbook of Texas, the community had a population of 125 in 2000. It is located within the Greater Austin metropolitan area.
McMahan (then called Wild Cat) was established by Ambrose Tinney in June 1832. The population of the community was 125 in 2000.
McMahan was part of the Lockhart Independent School District in 1949.