A new bath for the electrodeposition of Ni-Fe-Cr magnetic thin films has been developed. The bath is similar to a typical Permalloy electrodeposition bath, being modified only by the addition of 0.020M chromic chloride and 0.10M acetic acid. Deposits with up to 8 weight percent Cr were produced; the chromium content of the deposit increased with increasing current density. Current efficiencies of up to 50% were attained when at least one-half of the chromium in the bath was present as Cr3+. The acetic acid serves to limit the precipitation of nonmetallic material on the electrode by forming a soluble complex with Cr3+ and/or by buffering the pH at the electrode surface. The incorporation of chromium into the deposit is limited by the reduction rate of Cr2+ to Cr3+.