  Cosmology can provide information on the absolute scale of neutrino masses,
complementary to the results of tritium beta decay and neutrinoless double beta
decay experiments. We show how the analysis of data from the anisotropies of
the cosmic microwave background radiation and from the distribution of
cosmological large-scale structure, combined with other experimental results,
provides an upper bound on the sum of neutrino masses. We also discuss the
sensitivity of future cosmological data to neutrino masses.
