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NiFe 2 O 4 nano-crystallites with an average diameter of 8.9 nm are synthesized via hydrothermal method. The single-phase spinel structure is confirmed from X-ray diffractograms. Morphology is analysed by transmission and field emission scanning electron microscopes. High specific surface area of 55.7 m 2 g −1 is obtained for nano-particles. The M-H loop and M-T curve behaviours are investigated by vibrating sample magnetometry. The optical band gap energy is estimated from the UV-visible spectrum. In addition, the frequency dependence of dielectric properties is investigated. Cole-Cole plots are drawn to study electrical conduction mechanism and the kind of relaxation-Debye or non-Debye type. Low a.c. conductivity and low magnetic losses are noticed at 5 MHz frequency, which are suitable for microwave device applications.