Hyles euphorbiarum is a moth of the family Sphingidae. It is known from Chile, Argentina, the Falklands, Uruguay, Paraguay and southern Brazil. Adults have been recorded in March, July, September and November, but are probably on wing throughout the year. The larvae feed on Fabaceae, Nyctaginaceae, Onagraceae, Polygonaceae, Portulacaceae, Solanaceae and possibly Euphorbiaceae species.