| State: | KS |
| Type: | KS |
| Route: | 8 |
| Map Custom: | yes |
| Map Notes: | Southern segment highlighted in red, northern segment highlighted in blue |
| Length Mi: | 17.254 |
| Length Mi1: | 1.275 |
| Terminus A1: | near Kiowa |
| Terminus B1: | in Kiowa |
| Length Mi2: | 15.979 |
| Terminus A2: | near Athol |
| Terminus B2: | near Franklin |
| Counties: | North: Smith South: Barber |
| Direction A: | South |
| Direction B: | North |
| Previous Type: | KS |
| Previous Route: | 7 |
| Next Type: | KS |
| Next Route: | 9 |
| Section1: | Southern segment |
| Section2: | Northern segment |
K-8 is the name of two separate state highways in Kansas, United States. The southern highway is a 1.275adj=midNaNadj=mid road, linking Oklahoma State Highway 8 (SH-8) to the town of Kiowa. The northern highway is a 15.979adj=midNaNadj=mid road, linking U.S. Route 36 (US-36) near Athol to Nebraska Highway 10 (N-10) near the town of Franklin.
Classified as a major collector road,[1] the southern K-8 is a continuation of SH-8, linking northern Oklahoma to the town of Kiowa. Approximately halfway between the state line and the northern terminus, the highway crosses a single track originally belonging to the Atchison, Topeka and Santa Fe Railway, which is now part of BNSF Railway's Kansas Division.[2] [3]
The northern K-8, also classified as a major collector road,[4] begins at an intersection with US-36 near Athol, traveling north through rural farmland in northern Smith County. The highway terminates at the Nebraska state line, where the roadway continues as N-10.
K-8 was constructed between 1918 and 1932,[5] [6] traveling south-north through the middle of the state. By 1940,[7] the highways were truncated to their current segments. US-281 has replaced the former statewide K-8 as the primary link between Oklahoma and Nebraska. The northern section was renumbered as K-11. In 1959, K-11 was transferred back to K-8, and K-8 was on its current route.