Ba 8 (Mg 1−x Zn x )Nb 6 O 24 (x=0, 0.2, 0.4, 0.6, 0.8 and 1) ceramics were prepared through the conventional solid-state route. The materials were calcined at 1250°C and sintered at 1375–1425°C. The structure of the system was analyzed using X-ray diffraction and vibrational spectroscopic studies. The microstructure of the sintered pellet was analyzed using scanning electron microscopy. The dielectric constant (ε r ), temperature coefficient of resonant frequency (τ f ) and the unloaded quality factor (Q u ) were measured in the microwave frequency region. The τ f values of the compositions were reduced by varying the value of x from 0 to 1. The dielectric responses to frequency were also studied in the radio frequency region. The compositions have good microwave dielectric properties and hence are suitable for dielectric resonator applications.