| State: | TX |
| Type: | SH |
| Route: | 338 |
| Maint: | TxDOT |
| Map Custom: | yes |
| Map Notes: | SH 338, highlighted in red |
| Length Mi: | 6.722 |
| Length Round: | 3 |
| Established: | 1940 |
| Direction A: | South |
| Direction B: | North |
| Terminus A: | in Rocky Branch |
| Terminus B: | in Naples |
| Previous Type: | SH |
| Previous Route: | 337 |
| Next Type: | SH |
| Next Route: | 339 |
State Highway 338 (SH 338) is a 6.7223NaN3 state highway in the U.S. state of Texas. The highway begins at a junction with U.S. Highway 259 (US 259) in Rocky Branch and heads north to a junction with State Highway 77 (SH 77) in Naples.
SH 338 was designated on November 22, 1940, to serve as a route between Rocky Branch and Naples.
SH 338 begins at a junction with US 259 in Rocky Branch. It heads north from this junction to an intersection with FM 161. SH 338 reaches its northern terminus at SH 77 in Naples.