The rock sparrow or rock petronia (Petronia petronia) is a small passerine bird in the sparrow family Passeridae. It is the only member of the genus Petronia. It breeds on barren rocky hills from the Iberian peninsula and western north Africa across southern Europe and through the Palearctic Siberia and north and central China. It is largely resident in the west of its range, but Asian birds migrate to more southerly areas, or move down the mountains.