| State: | AZ |
| Type: | SR |
| Route: | 238 |
| Maint: | ADOT |
| Map Custom: | yes |
| Map Notes: | SR 238 highlighted in red |
| Length Mi: | 20.27 |
| Length Round: | 2 |
| Length Ref: | [1] |
| Established: | 1986 |
| Direction A: | West |
| Terminus A: | Maricopa Road near Mobile, Arizona |
| Direction B: | East |
| Terminus B: | in Maricopa |
| Previous Type: | AZ |
| Previous Route: | 210 |
| Next Type: | AZ |
| Next Route: | 260 |
| Counties: | Maricopa, Pinal |
State Route 238, also known as SR 238, is an east - west state highway in central Arizona.
While the mile markers indicate a start in Gila Bend, the highway is not actually part of the State Highway System until 11miles west of the Maricopa/Pinal County line near the Goodyear neighborhood of Mobile, at Mile Marker 24. The road west of this point is actually a county route. This stretch of road is known as Maricopa Road (except for a brief portion signed as Smith Enke Road within the city of Maricopa) and serves as a direct route between the two towns as well as an access road for the Sonoran Desert National Monument. It was originally a dirt road from Gila Bend to Maricopa, it was upgraded to a state highway to serve a proposed hazardous waste management facility west of Mobile. The official State Highway map shows this road terminating at Maricopa at the junction with State Route 347. Since its upgrade to a paved highway, this road has become a common shortcut for residents of the southern part of the Phoenix Metropolitan Area travelling to Yuma and San Diego.
Some road maps show a continuation of the route eastbound; after briefly overlapping a short southbound stretch of State Route 347 (also, confusingly, known as Maricopa Road or the John Wayne Parkway), the highway beelines southeast to its eastern terminus at Casa Grande; this stretch of the highway is known as the Maricopa-Casa Grande Highway. According to ADOT, this section of road is not currently commissioned https://web.archive.org/web/20060903194400/http://tpd.az.gov/gis/maps/pdf/MilePosts.pdf.
Virtually the entire road follows the Union Pacific Railroad's Sunset Route, with brief detours at the Maricopa and Casa Grande townsites.
The highway begins on Maricopa Road, MP 24.