The oscillator strength spectral density for the partial (through different individual Rydberg series) and total photoabsorption processes which determine the photoionization of N2O from its ground state has been studied. Despite its relevance for atmospheric chemistry and astrochemistry. only a few data seem to be available in the literature. The molecular-adapted quantum defect orbital (MQDO) method has been employed in the calculations. For the different ionization channels, continuity between the bound and continuum spectral regions has been achieved in the corresponding partial differential oscillator strengths. Good agreement with experiment has been found for the total photoionization cross section.