The polycrystalline samples of Ba 5 LaTi 3 - x Zr x Nb 7 O 3 0 (x=0, 1, 2 and 3) complex tungsten-bronze (TB) compounds were prepared using a high-temperature solid-state reaction technique. Room temperature preliminary X-ray diffraction (XRD) studies of the compounds showed the formation of single-phase compounds with an orthorhombic crystal structure. Detailed studies of dielectric properties ( , tanδ, σ a c ) of the above compounds as a function of frequency (200 Hz-1 MHz) at room temperature and as a function of temperature (-190 to 400 o C) at four different frequencies (1, 10, 100 and 1000 kHz) show that these compounds have a diffuse-type of phase transition with relaxing property. Transition temperature of the compounds was found to be below room temperature that increases with rise in frequency. The broadening of dielectric peaks and shift of T c upward with increasing frequency shows the relaxing behavior of these compounds.