PbTiO 3 ternary single crystals ͑PIN-PMN-PT͒ were reported to have broader temperature usage range ͑T R-T ͒ and comparable piezoelectric properties to Pb͑Mg 1/3 Nb 2/3 ͒O 3 -PbTiO 3 ͑PMNT͒ crystals. In this work, the orientation dependent dielectric, piezoelectric and electromechanical properties for PIN-PMN-PT crystals were investigated along ͗001͘ and ͗110͘ directions. The electromechanical couplings k 33 and k 32 for ͗110͘ poled crystals were found to be 0.91 and 0.91, respectively, with piezoelectric coefficients d 33 and d 32 on the order of 925 and Ϫ1420 pC/N. Of particular significance was the mechanical quality factor Q 33 for ͗110͘ oriented crystals, which was found to be Ն500, much higher than the Q values of ͗001͘ oriented relaxor-PT crystals ͑Q ϳ 70-200͒. The temperature dependence of the piezoelectric properties exhibited good temperature stability up to their ferroelectric phase transition T R-T ϳ 125°C, indicating ͗001͘ and ͗110͘ oriented PIN-PMN-PT are promising materials for transducer applications, with the latter for high power resonant devices where low loss ͑high Q͒ was required.