Hydrogen-nitrous oxide mixtures are potentially hazardous for nuclear waste storage and semi-conductor manufacturing processes. This system has been studied for decades and numerous fundamental data are available in the litterature. However, flame speed data for these mixtures are quite limited compared to more common mixtures. The purpose of the present study is to obtain additional data on the flame speed of hydrogen-nitrous oxide mixtures and to test the validity of several detailed kinetic schemes. The flame speed of H2-N2O mixtures, 60% Ar diluted, has been mesured in a spherical bomb over the equivalence ratio range 0.3-1.8. The initial pressure and temperature are ambiant. It is shown that the flame speed is relatively high with a maximum value around 56 cm/s for the stoichiometric mixture. The modeling results show that the different models tested give a relatively good estimate of the experimental data.