| State: | TX |
| Maint: | TxDOT |
| Type: | SH |
| Route: | 142 |
| Map Custom: | yes |
| Length Mi: | 16.9 |
| Length Round: | 2 |
| Established: | 1929 |
| Direction A: | West |
| Direction B: | East |
| Terminus A: | in San Marcos |
| Junction: | in Lockhart |
| Terminus B: | in Lockhart |
| Counties: | Hays, Caldwell |
| Previous Type: | SH |
| Previous Route: | 141 |
| Next Type: | SH |
| Next Route: | 143 |
State Highway 142 (SH 142) is a short Texas state highway that runs from San Marcos to Lockhart.
The route was designated on December 16, 1929 along its current route.[1] Prior to May 28, 2009, the route was located entirely within Caldwell County. In that year, the SH 142 designation was extended into Hays County, concurrent with SH 80, to a junction with Interstate 35.[2]