Disclosed herein is a microwave dielectric ceramic composition which comprises a compound represented by the formula BaO.multidot.xTiO.sub.2 (where 3.7.ltoreq.x.ltoreq.4.5) which is incorporated with 1.0-10 wt. % Ba.sub.3 Ti.sub.12 Zn.sub.7 O.sub.34 and 2-8 wt. % Ta.sub.2 O.sub.5. It has well-balanced performance owing to a Q value not less than 8000 (at 4.5 GHz), a relative permittivity .epsilon. not less than 31, and a practical temperature coefficient in the range of -15 to +10 ppm/.degree.C. It may be further incorporated with 0.1-0.4 wt. % MnO.sub.2 for improved sinterability in addition to the above-mentioned performance.