Plutonium and uranium nitrides have been synthesized by reacting a solution of the actinide iodide and a solution of sodium, potassium, or calcium in anhydrous liquid ammonia. The precipitate was identified by elemental analysis, infrared absorption, and x-ray diffraction. Nitrides are of interest as fast breeder reactor fuels, in part because of their high thermal conductivity and high metal atom density; however, they have been difficult to prepare and fabricate. This low-temperature synthesis is potentially advantageous because of its simplicity, because the finely divided nitride precipitate is expected to be more easily sintered than nitride prepared by conventional techniques, and because it does not require preparation of the metal as an intermediate step.