Ceramic materials are usually hard and resistant to compression, but are also fragile in relation to shear stresses and exhibit low impact strength. In this way, a variety of researches has been conducted to improve their fracture resistance and other mechanical properties of technological interest. In this this work, Ba0.3Na0.7Ti0.3Nb0.7O3 ceramics were synthesized and their mechanical properties, as the Dynamic Young’s Modulus, the Shear Modulus, the Poisson’s Ratio and the Fracture Toughness, were carefully characterized. Single-phased Ba0.3Na0.7Ti0.3Nb0.7O3 samples were processed by dry high-energy ball milling by using analytical graded BaCO3, TiO2, Nb2O5 and Na2CO3 precursors (Alfa Aesar). The optimized milling conditions were 300 rpm for 3 h, with a ball to powder mass ratio of 12:1. The milled powders were heat-treated in oxygen atmosphere at 1180oC for 1 h. The powders were compacted into bars and their mechanical properties were determined by using the impulse excitation and the four-point or three-point flexure tests methods, according to the E1876_09 and ASTM C1421_15 standards. It was observed that all analyzed mechanical properties are intimately dependent of the ceramics density, increasing with the increase of this parameter.