Spinel ferrites have attracted considerable attention and efforts continue to investigate them for their technological importance to the microwave industries, high speed digital tape or disk recording and magnetic refrigeration system. NiFe₂O₄ was prepared by mixing pure nickel oxide and iron oxide, dried, pressed at 150, 200, and 250 kg/cm², then fired at 1273, 1373 and 1473 K for 10 hours. X-ray diffraction was used to assess the formation of NiFe₂O₄. Results showed that density increases with increasing either hydraulic pressing and firing temperature. Magnetic properties are measured and an isoperm hystersis loop is obtained, remenant magnetic flux induction, saturation magnetic flux induction and corecive force are calculated and found to be density dependant. Electrical properties of NiFe₂O₄ were measured and it was found that it has low electrical conductivies (10^-6-10^-8 Ω^-1cm^-1), and values of dielectric constant, and dielectric loss are consistant with semiconductors properties.