Natural radionuclides and heavy metals in bottled waters of the major brands in Greece were measured. Gross alpha- and beta-activities were evaluated first; subsequently Ra-226 was measured by alpha spectroscopy. Tritium and uranium activities were assessed with liquid scintillation counting. Heavy metals were determined by X-ray fluorescence spectroscopy following pre-concentration. A correlation of activity concentrations with the chemical parameters of waters was also attempted. Dose calculations for different age groups were finally performed.