Sympistis cocytus

{{Short description|Species of moth}}

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| taxon = Sympistis cocytus

| authority = Troubridge, 2008

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Sympistis cocytus is a moth of the family Noctuidae first described by James T. Troubridge in 2008.{{cite web |editor-last=Savela |editor-first=Markku |date=June 19, 2020 |url=https://ftp.funet.fi/pub/sci/bio/life/insecta/lepidoptera/ditrysia/noctuoidea/noctuidae/oncocnemidinae/sympistis/#cocytus |title=Sympistis cocytus Troubridge, 2008 |website=Lepidoptera and Some Other Life Forms |access-date=January 10, 2021}} It is found in North America from south central British Columbia south to eastern Oregon at elevations from the tree line to the ponderosa pine zone of {{convert|2000|to|6300|ft|m}}.

The wingspan is {{convert|32|to|39|mm|in|abbr=on}}. Adults are on wing from mid-August to late September.{{cite web |url=http://mothphotographersgroup.msstate.edu/species.php?hodges=10077.2 |title=931872.00 – 10077.2 – Sympistis cocytus Troubridge, 2008 |website=North American Moth Photographers Group |publisher=Mississippi State University |access-date=January 10, 2021}}