The Carnarvon Highway is a state highway of Queensland, Australia, linking Moree south of the NSW/QLD border, via the town of St George, eventually to the township of Rolleston. Formerly, north of Roma it was known as the Carnarvon Developmental Road. National Route 46 runs from Mungindi to the Castlereagh Highway just south of St George. From here, the A55 continues north, through St George and Surat to Roma.