Anion diffusion was simulated in the system, (Y0.2Zr0.8)-(O1.72N0.15), using molecular dynamics and empirical potentials of Buckingham type. Nitrogen potentials had to be developed in order to describe nitrogen migration, assuming the interaction, of charged nitrogen shells with a mass of 0.15amu, with cores. Comparing experimental and simulated anion diffusivities, the diffusion coefficients were found to be of similar order. Nitrogen, however, diffused five times slower than oxygen according to the computer simulation while, experimentally, the difference was smaller. The calculated activation enthalpies were 1.2 and 1.4eV, respectively, for the two elements with corresponding pre-exponential factors of 10-5 and 10-4cm2/s.Molecular Dynamics Calculations of Anion Diffusion in Nitrogen-Doped Yttria-Stabilized Zirconia. Kilo, M., Homann, T., Bredow, T.: Philosophical Magazine, 2007, 87[6], 843-52