| State: | OK |
| Type: | SH |
| Route: | 120 |
| Map Custom: | yes |
| Maint: | ODOT |
| Length Mi: | 3.04 |
| Length Ref: | [1] |
| Established: | ca. 1956 |
| Direction A: | West |
| Direction B: | East |
| Terminus A: | in Rock Island |
| Terminus B: | at the Arkansas state line |
| Previous Type: | SH |
| Previous Route: | 117 |
| Next Type: | SH |
| Next Route: | 123 |
State Highway 120, also abbreviated as SH-120 or OK-120, is a 3.04adj=midNaNadj=mid highway in the eastern part of the state of Oklahoma, USA.[1] It connects to SH-112 at Rock Island on its western end and passes through Le Flore County to the Arkansas state line, where it becomes Highway 10 running to Little Rock.[2]
Highway 120 begins at SH-112 and heads due east. It serves the town of Rock Island. Near its midpoint, SH-120 crosses Ivy Branch. It then has a railroad crossing. The road curves to the south as it passes through an area of sandy terrain.[3] The highway then ends at the Arkansas state line, west of Hackett, Arkansas.
SH-112 first appears on the 1957 state highway map, implying that it was commissioned in 1956. At that time, the entire length of the highway was gravel.[4] The road was paved in 1968.[5] The road has always had the same general route.