The Luhan or Lugan (Ukrainian: Лугань or Russian: Лугань), also known as the Luhanka or Luganka (Луганка), is a river in the Donbas region of Ukraine, a right tributary of the Seversky Donets, in the basin of the Don. It is 198 kilometres (123 mi) long, and has a drainage basin of 3,740 square kilometres (1,440 sq mi). The city of Luhansk, which stands where the river Vilkhivka [uk] flows into the Luhan, took its name from the river. The Luhan river itself derives its name to the word "Luh" (Ukrainian: Луг, lit. 'meadow') and referring to the floodplains around it. Zaporozhian Cossacks lived here back in 1630s and 1650s.

The Luhan river rises in the eastern part of Horlivka in Donetsk Oblast.^{[citation needed]}