Mn doping in SrTiO₃ leads to the emergence of qualitatively distinct and novel physical properties. We show that Mn ions can be controllably doped at either of the perovskite 𝐴(Sr) or 𝐵(Ti) site as well as at both sites simultaneously and the resultant physical properties depend intimately on the particular dopant site. We critically review the recent literature on various Mn-doped SrTiO₃ systems, which includes reports of dielectric glass, spin-glass and ferromagnetism and by combining experiments with first-principles calculations, we demonstrate that depending on the particular dopant site for Mn ions, the dielectric properties can be widely tuned from a quantum paraelectric to a dielectric glass. However, the intrinsic magnetism in all these cases remains essentially paramagnetic for phase-pure systems.