We have obtained nuclear gamma resonance absorption spectra of 61Ni in Ni-Pd alloys over the entire concentration range. Both source and absorber were held at 4.2 °K. The spectra show at every Pd concentration a distribution of magnetic hyperfine fields. The measured average absolute value of the hyperfine field < |Hhf| > decreases from 76.1 kOe at pure nickel to a minimum of 31 kOe at Ni-Pd (45 at. %) and then increases to 173 kOe at Ni-Pd (90 at. %). The alloys are ferromagnetic up to Ni-Pd (98 %). The sign of Hhf in pure nickel is negative and at Ni-Pd (90 %) it is positive. A model based on the assumptions : (a) the hyperfine field at any 61Ni nucleus is determined by the distribution of nickel and palladium atoms on neighboring lattice sites, and (b) the palladium atoms give a strong positive contribution to the field, gives qualitative agreement with our observations