Longtan Subdistrict () is a subdistrict and the county seat of Guiyang County in Hunan, China. The town was formed through the amalgamation of 4 communities of the former Chengguan Town (), 3 villages of the former Chengjiao Township (), Wutong Village () of Renyi Town (), Shanbei Village () of Zhangshi Town () and 3 state-owned farms in 2012. It has an area of with a population of 52,300 (as of 2012), and its seat is at Bazitang Community ().