K-23 is a state highway in Kansas. It starts as a continuation of Oklahoma Route 23 and it runs north to US 83 and K-383.

K-23 begins its northerly journey at the Kansas-Oklahoma State Line northwest of Forgan, Oklahoma, picking up northbound traffic from Oklahoma Highway 23. It traverses flat land with a few hills, passing near Meade Lake, then intersects US Routes 54 and 160 in downtown Meade. After leaving Meade, it starts to traverse rolling hills until K-98, where the road levels out. K-23 intersects US Route 56 on its way to Cimarron, where it intersects US Routes 50 and 400. North of Cimarron, the route alternates between flat and hilly land through farmland, intersecting K-156 north of Cimarron, with northbound K-23 forming a five-mile-long concurrency with K-156 West, before K-23 turns back north, levels out and heads toward Dighton, the only city in Lane County. There it intersects K-96, and north of Dighton the route intersects K-4, with northbound K-23's mainline becoming westbound K-4's mainline. After leaving K-4, it travels north to Gove City, and continues to Grainfield, where it intersects I-70 and US Route 40, where northbound K-23 becomes concurrent with I-70's eastbound mainline for about two miles before turning north again. North of Grainfield, rolling hills alternate with the flatter land. In Hoxie, US Route 24 is intersected. North of Hoxie, the road intersects K-123, turns west. then intersects K-223. K-23 continues west until its northern terminus at US Route 83 and K-383.

Business K-23 starts at the K-23 South Interchange with I-70. Mainline K-23 uses I-70 east for a few miles. Business K-23 follows I-70's Outer Road for 3/4 mile, when it turns north on Main Street. The route passes through downtown Grainfield. When Main Street ends, the highway turns east and heads back toward mainline K-23.