Structural, dielectric and ferroelectric properties of tungsten (W) substituted SrBi 2 (Ta 1−x W x ) 2 O 9 (SBTW) [x=0.0, 0.025, 0.05, 0.075, 0.1 and 0.2] have been studied as a function of sintering temperature (1100–1250°C). X-ray diffraction patterns confirm the single-phase layered perovskite structure formation up to x=0.05 at all sintering temperatures. The present study reveals an optimum sintering temperature of 1200°C for the best properties of SBTW samples. Maximum T c of ∼390°C is observed for x=0.20 sample sintered at 1200°C. Peak-dielectric constant (ε r ) increases from ∼270 to ∼700 on increasing x from 0.0 to 0.20 at 1200°C sintering temperature. DC conductivity of the SBTW samples is nearly two to three orders lower than that of the pristine sample. Remnant polarization (P r ) increases with the W content up to x≤0.075. A maximum 2P r (∼25μC/cm 2 ) is obtained with x=0.075 sample sintered at 1200°C. The observed behavior is explained in terms of improved microstructural features, contribution from the oxygen and cationic vacancies in SBTW. Such tungsten substituted samples sintered at 1200°C exhibiting enhanced dielectric and ferroelectric properties should be useful for memory applications.