Silenus, Silen or Sileni may refer to:
Mythology Silenus, a satyr and companion to Dionysus Silen and its plural sileni may refer to the mythological figure as a type that is sometimes thought to be differentiated from a satyr Satyr, also known as a silenos, a male nature spirit
Biology A butterfly, Myrina silenus A damselfly, Drepanosticta silenus The lion-tailed macaque, Macaca silenus The prowfish, Zaprora silenus
People Silenus Calatinus, a 2nd century BC Sicilian Greek historian
Other Šílení (Lunacy), a 2005 Czech film