K-22 is a 3.087-mile-long (4.968 km) north–south highway in the U.S. state of Kansas. Located entirely within Washington County, the route runs from U.S. Route 36 (US-36) north to the city limit of Haddam. A previous designation of the route existed in the 1930s from Wichita to Topeka, but was deprecated. The current alignment was designated in the 1940s.