Here, we report our results on the synthesis and properties of pure and 3d transition metal substituted zinc ortho-titanate (Zn 1−x M x ) 2 TiO 4 dielectrics. Polycrystalline (Zn 0.95 M 0.05 ) 2 TiO 4 (M=Mn 2+ , Co 2+ , Ni 2+ or Cu 2+ ) samples of sintered density ≥94%, were prepared by ceramic powder mixing and solid state reaction followed by sintering (in air) between 1060 and 1180°C. The XRD patterns of the furnace cooled samples revealed single ortho-titanate tetragonal inverse spinel phase. The SEM micrographs showed fairly uniform grains between 5 and 25μm depending upon the composition. Dielectric measurements on the samples were made at low frequencies (1kHz to 1MHz) from 30 to 450°C. The dielectric constant (ε′r) and dielectric loss (tanδ), at all the frequencies, were found to rise with progressive increase in sample's temperature albeit the rise being less at higher frequencies (≥100kHz). The room temperature values of ε′r were between 21 and 26 (depending on the 3d M 2+ ion) and remained almost constant in the entire low frequency range ≤100kHz. Both ε′r and tanδ were found to decrease with increasing frequency at higher temperatures (>200°C). At microwave frequencies (7.0–7.5GHz), the room temperature values of ε′r for all the (Zn 0.95 M 0.05 ) 2 TiO 4 samples were found to be in the range 18–20 and the unloaded quality factor (Q u ·f) values ranged between 2100 and 9650GHz. The (Zn 0.95 M 0.05 ) 2 TiO 4 (M=Mn 2+ or Cu 2+ ), samples exhibited over four times improvement in quality factor vis-à-vis pure Zn 2 TiO 4 , which is attributed to relative increase in grain size and density in case of Cu 2+ , and reduction in tetragonality of the unit cell for Mn 2+ substitution.