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TiO₂–Co–hydroxyapatite (TCN–HA) powders, in which TCN prepared by an alloying–recomposition–oxidation–sintering process was mixed with HA (5–40 vol%), were sintered at 1100, 1200, 1300, and 1400 °C. Structural characterization was performed using X-ray diffraction, field-emission scanning electron microscopy, and energy-dispersive spectroscopy. The relative density (RD) of the sintered TCN–20HA increased until 1200 °C, followed by a rapid decrease at temperatures higher than 1300 °C. The density decrease at higher temperatures was related to the release of a large amount of H₂O by the decomposition of hydroxyapatite (HA). The flexural strengths and fracture toughness of the TCN–HA samples with HA contents up to 20 vol% and Vickers hardness of all of the samples were higher than those of the pure TCN sample. The enhancements in their mechanical properties could be attributed to the …