Ceylanosticta nancyae, or Alwisi's shadowdamsel, is a species of damselfly in the family Platystictidae. It is endemic to Sri Lanka, which was found recently from Samanala Nature Reserve, Ratnapura.
The species name nancyae was named as an honor for Nancy van der Poorten, who is a renowned Sri Lanka odonatologist, and mentor of the research team.