Natans may refer to:
Aponogeton natans, species of aquatic plant in the family Aponogetonaceae Atractus natans, species of snake in the family Colubridae Bigelowiella natans, species of alga in the family Chlorarachniaceae Bryaninops natans, species of marine fish in the family Gobiidae Caltha natans, species of flowering plant in the family Ranunculaceae Crassula natans, commonly known as floating pigmyweed, is a herb in the family Crassulaceae Haloplanus natans, halophilic Archaeon in the family Halobacteriaceae Hydroscapha natans, species of skiff beetle in the family Hydroscaphidae Potamogeton natans, aquatic species in the family Potamogetonaceae Sagittaria natans, species of flowering aquatic plant in the family Alismataceae Salvinia natans, species of annual floating aquatic fern in the family Salviniaceae Sargassum natans, species of brown algae in the family Sargassaceae Sparganium natans, species of bur-reed in the family Typhaceae Sphaerotilus natans, aquatic periphyton bacterial organism in the family Comamonadaceae Typhlonectes natans, species of caecilian in the family Typhlonectidae