South Lansing is a census-designated place in the town of Lansing, Tompkins County, New York, United States. The CDP includes the hamlets of South Lansing, Terpening Corners, and Asbury. The area was first listed as a CDP prior to the 2020 census. The community is in northern Tompkins County, southeast of the geographic center of the town of Lansing. It is the location of the Lansing Town Hall.