Lansing is a city in Leavenworth County, Kansas, United States. It is on the west side of the Missouri River and Kansas-Missouri state border. In 2010, 11,265 people lived there. It is the second biggest city in Leavenworth County. It is part of the Kansas City metropolitan area.

The Lansing Correctional Facility (used to be called the Kansas State Penitentiary), which includes the state's main maximum-security prison, is in Lansing.