The effects of Bi, Li and Ti substitutions for K, Na, Li, Nb and Sb on the piezoelectric properties of (1 – x)(K_0.474Na_0.474Li_0.052)(Nb_0.948Sb_0.052)O₃–xBi_0.5Li_0.5TiO₃ [(1 – x)KNLNS–xBLT] ceramics were investigated. X-ray powder diffraction profiles indicate the formation of a morphotropic phase boundary (MPB) between the orthorhombic and tetragonal phases in the (1 – x)KNLNS–xBLT ceramics. The ratio of tetragonal to orthorhombic phase increased with x, which suggests a decrease in the orthorhombic-tetragonal phase transition temperature (T_O–T). The dielectric constant at room temperature was increased by the substitution of Bi, Li and Ti for K, Na, Li, Nb and Sb. In addition, the temperature dependence of the dielectric constant indicated a T_O–T shift from approximately 90°C to room temperature, and resulted in a piezoelectric constant of 272 pC/N for the 0.98KNLNS-0.02BLT (x = 0.02) ceramic.