Nacaduba calauria

{{Short description|Species of butterfly}}

{{Italic title}}

{{Speciesbox

| name = Dark Ceylon six-lineblue

| image = Nacaduba calauria evansi – Dark Ceylon Six-Lineblue.jpg

| image_caption = Subspecies evansi in Sri Lanka

| taxon = Nacaduba calauria

| authority = (C. Felder, 1860)

}}

Nacaduba calauria, the dark Ceylon six-lineblue, is a species of lycaenid butterfly found in Indomalayan realm.{{Cite book|url=https://www.researchgate.net/publication/287980260|title=A Synoptic Catalogue of the Butterflies of India |last1=Varshney |first1=R.K. |last2=Smetacek|first2=Peter|publisher=Butterfly Research Centre, Bhimtal & Indinov Publishing, New Delhi|year=2015|isbn=978-81-929826-4-9|location=New Delhi|pages=127|doi=10.13140/RG.2.1.3966.2164}}{{cite web |last=Savela |first=Markku |url=http://www.nic.funet.fi/pub/sci/bio/life/insecta/lepidoptera/ditrysia/papilionoidea/lycaenidae/polyommatinae/nacaduba/#calauria |title=Nacaduba calauria (Felder, 1860) |website=Lepidoptera and Some Other Life Forms |access-date=July 2, 2018}}

and New Guinea.