Nano-particles of CaZrO3 were successfully synthesized at 850°C using the molten-salt method, and the influence of using nano-size ZrO2 on formation of CaZrO3 was investigated. CaCO3, Na2CO3, NaCl, nano-ZrO2 and micro-ZrO2 were used as starting materials. On heating, Na2CO3–NaCl molten eutectic salt provided a liquid medium for reaction of CaCO3 and ZrO2 to form CaZrO3. The results demonstrated that in both nano and micro-ZrO2 inclusive samples, CaZrO3 started to form at about 750°C and that, after the temperature was increased to 1050°C, the amounts of CaZrO3 in the resultant powders increased with a concomitant decrease in CaCO3 and ZrO2 contents. After washing with hot-distilled water, the samples containing nano and micro-ZrO2 heated for 4h at 850°C and 1050°C, were single-phase CaZrO3 with 90–95nm and 400–500nm particle size, respectively. Furthermore, the synthesized CaZrO3 particles retained the size and morphology of the ZrO2 powders, which indicated that a template formation mechanism dominated the formation of CaZrO3 by molten-salt synthesis.