Ferromagnetic resonance absorption has been measured in a series of nickel-copper alloys having compositions Ni 50% Cu 50%, Ni 45% Cu 55%, Ni 42% Cu 58% by weight. The temperature range over which measurements were made included the individual Curie points of the alloys. The experiments were carried out at 3.19 cm and 8.8 mm wavelength. Absorption lines were observed in both the ferromagnetic and paramagnetic phases, and the line-width was found to be a maximum at the Curie point. It was also frequency dependent, being roughly twice as great at 8.8 mm as compared with 3.19 cm. The g-factor had the value 2.22 ± 0.02 for the ferromagnetic phase of each alloy.