K-129 (1947–1966 Kansas highway)

K-129 was a 3.25-mile-long (5.23 km) state highway in the U.S. state of Kansas. K-129's southern terminus was at U.S. Route 24 (US-24) in the city of Beloit and the northern terminus was at US-24 and K-9 in Beloit. Within the city, the highway briefly overlapped K-14.

K-129 was first designated as a state highway on October 22, 1947, to a highway running from the north city limits of Beloit to K-9. On February 28, 1951, it was approved to realign US-24 further along K-9 and to the east of Beloit. Around this time K-129 was extended south to K-14, then along the former routing of US-24.