The incorporation of chromium on the strontium site of the perovskite lattice ofSrTiO3 ceramics and its influence on the structural, microstructural andlow-frequency dielectric properties is studied in this work. DenseSr1−1.5xCrxTiO3 (x = 0, 0.0005,0.0010, 0.0015) ceramics are prepared from powders obtained by a sol–gel method. The lattice parameter∼3.906 Å and averagegrain size ∼2.5 µm are almost identical for all the ceramic samples under study. On theother hand, the dielectric constant increases from approximately 7000 forx = 0 to>16 000 for x = 0.0005. Detailed investigations of the low-temperature dielectric properties show a remarkableincrease of the tunability and nonlinearity of the dielectric constant as a function of dc biasfield in strontium titanate ceramics modified by chromium doping but no ferroelectric orrelaxor-like behaviour. These results imply the possible incorporation of small Cr amountson the Sr site of strontium titanate ceramics and expand the tunable applications ofSrTiO3-based materials.