A study has been made of the diffusion of nitrogen in beta zirconium in the temperature range of 900° to 1600°C at one atmosphere pressure. Diffusion‐rate calculations based on a solution of the usual diffusion equation gave a diffusion coefficient, . The energy of activation of diffusion, 33,600 cal/mole, has a probable error of 1,600 cal/mole. The limiting solubilities of nitrogen in beta zirconium were determined from the diffusion data.