Polygaster

{{Short description|Genus of flies}}

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| taxon = Polygaster

| authority = Wulp, 1890{{cite book |last1=Wulp |first1=F.M. van der |title=Fam. Muscidae. Pp. 41–56. [Cont.] In: Godman, F.D. and Salvin, O., eds., Biologia Centrali-Americana, or, contributions to the knowledge of the fauna and flora of Mexico and Central America. Zoologia. Class Insecta. Order Diptera. Vol. II. [1888–1903.] |date=1890 |publisher=Taylor & Francis |location=London |pages=489 pp + 13 pls}}

| type_species = Polygaster ivu

| type_species_authority = Wulp, 1890

| synonyms =*Polyhaster Zetina, Et Al. 2018{{cite journal |last1=Zetina |first1=D.H. |last2=Romero-Napoles |first2=J. |last3=Contreras-Ramos |first3=A. |last4=Carrillo-Sánchez |first4=J.L. |title=Checklist of Tachinidae (Insecta, Diptera) in Mexico |journal=Transactions of the American Entomological Society |date=2018 |volume=144 |pages=1–89|doi=10.3157/061.144.0113 }}

• Polygastropsis Townsend, 1919{{cite journal |last1=Townsend |first1=Charles Henry Tyler |title=New muscoid genera, species and synonymy (Diptera) |journal=Insecutor Inscitiae Menstruus |date=1919 |volume=6 |issue=157–182 |url=https://www.biodiversitylibrary.org/page/8197836#page/393/mode/1up |access-date=16 December 2020}}
• Actinomintho Townsend, 1928{{cite journal |last1=Townsend |first1=C.H.T. |title=New Muscoidea from humid tropical South America |journal=Wiener Entomologische Zeitung |date=1928 |volume=44 |pages=143–154}}

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Polygaster is a genus of flies in the family Tachinidae.{{cite web |last1=O’Hara |first1=James E. |last2=Henderson |first2=Shannon J. |first3=D. Monty |last3=Wood |title=Preliminary Checklist of the Tachinidae (Diptera) of the World|url=http://www.nadsdiptera.org/Tach/WorldTachs/Checklist/Tachchlist_ver2.1.pdf |website=Tachinidae Resources |access-date=16 February 2024 |date=5 March 2020}}