[en] The isotopic composition of palladium has been measured in a range of terrestrial and meteoritic material using solid-source mass spectrometry. Within the limits of experimental error the isotopic composition of palladium was found to be uniform in all terrestrial samples, except a precious metal concentrate from South Africa, in which it was isotopically fractionated by 3.8 promille per mass unit with the enrichment in the heavy isotopes. This places a limit of 1 part in 10⁴ on the accuracy to which the atomic weight of terrestrial palladium can be known. Apart from linear fractionation effects, the measured isotope abundances are in excellent agreement with the work of Shima et al. and Kelly and Wasserburg. Isotopic data from a selection of iron and stone meteorite samples did not reveal any evidence of inhomogeneous mixing of r- and s-process nuclides. If r-process material has been added to the meteorites, it must constitute less than 0,3% of the palladium present. (orig.)