Vodnik may refer to:
- Vodnik (sports society), a Soviet Voluntary Sports Society
- Vodnik (mythology), a male water spirit in Slavic mythology
- Vodník (poem), written by Antonín Dvořák in 1896
- Vodnik Arkhangelsk, a bandy club from Arkhangelsk in Russia.
- Vodyanoy or Vodnik, a male water spirit
- GAZ-3937 "Vodnik", a Russian high-mobility multipurpose military vehicle manufactured by GAZ
- Vodnik, the Croatian name for Vodnic village, Lupac Commune, Caraş-Severin County, Romania
- The rank denoting a current-day Sergeant in the Militia of the SFR Yugoslavia