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Nanocrystalline polymeric complex (Ni 0.5 Zn 0.4 Cu 0.1 ) ferrite substituted cobalt (Co) ferrite system has been synthesized by chemical co precipitation method. The dielectric properties of polymeric spinel ferrite system (Ni 0.5 Zn 0.4 Cu 0.1 Fe 2 O 4 ) x (CoFe 2 O 4 ) 1-x have been investigated. Some of the dielectric parameters such as dielectric permittivity e′ and loss tangent (tan δ) were studied as a function of frequency in the range 1 Hz-1 MHz and of temperature in the range 230-410 K. Excessive dependency of dielectric properties on frequency and temperature with the presence of two relaxation mechanisms, which are called as major and minor, have been observed. From Argand diagram analysis a and De values for these two kinds of relaxation curves have been determined for all the samples in the measured temperatures. The reported dielectric properties are thought to be meaningful for future applications.