A review of electrodeposition procedures for the preparation of 237Np is given and two new procedures reported making use of “molecular plating”. High voltage - low current yield determinations were carried-out in the region 500–1700 V dc with a deposition current constant at 1.0 mA. The suitability of aluminium, titanium, copper and stainless steel as cathode material was also investigated. It was found that using stainless steel as a cathode and a voltage of 1700 V for a 10 min period resulted in a yield of 100% 237Np, providing that the total solids in solution were within the limits of 20 μg/cm 2 to 500 μg/cm 2. The quality of the layers produced by the described method make them very suitable for alpha-spectrometry and for the fabrication of fission detectors.