The Open Skies Treaty between Hungary and Romania, formally "Agreement Between the Government of Romania and the Government of the Republic of Hungary on the Establishment of an Open Skies Regime" ("Acord din 11 mai 1991 intre Guvernul Romaniei si Guvernul Republicii Ungaria privind stabilirea unui regim de Cer Deschis" in Romanian) was a bilateral agreement between Hungary and Romania.