Thelairophasia

{{Short description|Genus of flies}}

{{Automatic taxobox

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| taxon = Thelairophasia

| authority = Townsend, 1919{{cite journal |last1=Townsend |first1=C.H.T. |title=New muscoid genera, species and synonymy (Diptera). [Concl.] |journal=Insecutor Inscitiae Menstruus |date=1919 |volume=6 [1918] |pages=157–182 |url=https://www.biodiversitylibrary.org/page/8197836#page/393/mode/1up |access-date=1 April 2022}}

| type_species = Thelairophasia transita

| type_species_authority = Townsend, 1919

| synonyms =

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Thelairophasia 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=30 November 2023 |date=5 March 2020}}