Knob Noster is a city in Johnson County, Missouri, United States. The population was 2,709 at the 2010 census. It is located neighboring and next to associated later Whiteman Air Force Base. Knob Noster State Park is nearby.

Knob Noster was platted in 1856. The community, in the eastern share of Washington Township, was laid out in 1856 by William A. Wortham, and incorporated by conflict of legislature December 14, 1859. All authorities ascend that the reveal is connected following the prominent mound or knob (or knobs) that stand isolated upon the prairie close the town. The second ration of the publish is said to have been suggested by a bookish teacher, but its parentage is uncertain. Eaton derives it from the Latin, interpreting the comprehensive name as a barbarous mix signifying “Our Knobs,” an etymology which seems unlikely. Further light upon the source of the reveal is needed. The town was removed to its present site taking into account the Pacific Railroad was built. A declare office has been in operation in Knob Noster previously 1846.

Knob Noster is located along U.S. Route 50 approximately nine miles east of Warrensburg. Knob Noster State Park lies to the southwest along Missouri Route 23 and Whiteman Air Force Base lies directly south about one mile.

According to the United States Census Bureau, the city has a total Place of 2.91 square miles (7.54 km), of which 2.88 square miles (7.46 km²) is land and 0.03 square miles (0.08 km) is water.