This paper reports on the densification of TiB₂ by hot pressing using WSi₂ as sinter additive. The dense pellets were evaluated for mechanical, physical and thermal properties. Isothermal oxidation studies were carried out at 850 ^°C. Thermal shock resistance of this composite was evaluated by repeated heating/cooling cycles between 850 ^°C and 150 ^°C. Microstructural observations of hot pressed and oxidized samples were made using SEM-EDAX and XRD. Pellets of near theoretical density were obtained by hot pressing of the powder mixtures at 1600 °C and a pressure of 30MPa with ≥5% addition of WSi₂. W₅Si₃ phase was identified as a reaction product of hot pressing. Hardness values of the composite with varying WSi₂ were measured and these were found to be in the range of 24–26 GPa. Fracture toughness was in the range of 4–6MPa.m^1/2 which is higher than that of monolithic TiB₂ (3–4MPa.m1/2). Crack deflection and bridging mechanisms were responsible for the higher fracture toughness. Coefficient of thermal expansion wasmeasured up to 900 °C. Improved oxidation behavior was observed in the TiB₂+WSi₂ composite as compared to that of monolithic TiB₂. TiO₂ and SiO₂ phases were identified on the surface of the oxidized samples. Excellent thermal shock resistance was observed in TiB₂+15%WSi₂ composites even after 800 cycles.