Poecilasthena thalassias

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| image = Poecilasthena thalassias1.jpg

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| taxon = Poecilasthena thalassias

| authority = (Meyrick, 1891)[https://archive.today/20120801123323/http://www.environment.gov.au/biodiversity/abrs/online-resources/fauna/afd/taxa/dd3851f1-ecc1-4530-aed2-366c06703f7a Australian Faunal Directory]{{cite web |last=Yu |first=Dicky Sick Ki |url=http://www.taxapad.com/local.php?taxonidLC=82863499 |title=Poecilasthena thalassias (Meyrick 1891) |website=Home of Ichneumonoidea |publisher=Taxapad |archive-url=https://web.archive.org/web/20160326111243/http://www.taxapad.com/local.php?taxonidLC=82863499 |archive-date=26 March 2016}}

| synonyms =

• Asthena thalassias Meyrick, 1891
• Asthena pellucida T.P. Lucas, 1892

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Poecilasthena thalassias is a moth of the family Geometridae. It is known from Australia.