K-177 is a state highway in central Kansas. It runs from US-54 near El Dorado to Manhattan, passing through the Flint Hills. It is part of the Flint Hills Scenic Byway and the Prairie Parkway.

From its beginnings east of El Dorado, K-177 heads northward to provide access to El Dorado Lake. It then approaches the Kansas Turnpike and runs parallel to it before having a junction with it (exit 92). It then passes through Matfield Green and Bazaar before reaching Cottonwood Falls, Strong City, and US-50.

Flint Hills Scenic Byway is a portion of K-177 located in the Flint Hills region of the state, stretching from Interstate 35 at Cassoday in the south to US-56 at Council Grove in the north. Along the byway there are rolling hills and some of the only tallgrass prairie left in North America. It is a National Scenic Byway.

North of Strong City, K-177 passes through the Tallgrass Prairie National Preserve. In Council Grove, it meets US-56. It has a brief concurrency with K-4 near Alta Vista before having an interchange (exit 313) with Interstate 70. Nine miles north of I-70, it ends at US-24 in Manhattan.

From I-70 to US-24, K-177 is named the Coach Bill Snyder Highway, in honor of the long-time Kansas State University football coach who transformed the Wildcats from the worst team in major college football into consistent winners.[citation needed]

K-177 is two lanes from US-54 to I-70 and a four-lane expressway from I-70 to US-24.

K-177 was signed as K-13 until 1965. It previously ended at US-77 before El Dorado Lake was completed.