Despite considerable biocompatibility of hydroxyapatite bioceramic, its application is limited due to poor mechanical properties. This problem can be solved through the production of composites with other ceramics, such as the titanates. In the present study, calcium titanate and barium titanate nanopowders were prepared by sol-gel method and nanocomposite coatings of hydroxyapatite-calcium titanate and hydroxyapatite-barium titanate were then made by deep coating method and characterized. To produce coatings with the best properties, 10, 20 and 30 wt% of calcium titanate particles as reinforcement were distributed in hydroxyapatite matrix. Structure and morphology of the nanopowders and coatings were investigated using X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX). In order to evaluate the bioactivity, the coated samples were immersed in the simulated body fluid for 3, 7, 14 and 28 days at 37 °C. To evaluate the corrosion behavior, especially pitting corrosion of coated and primary uncoated samples, the electrochemical corrosion tests were used. The mechanical properties of coatings were also investigated using nano-indentation tests. The results from the present investigation confirmed that the nanoparticles were successfully formed and the suitable amount of reinforcement used in the hydroxyapatite matrix was 20 wt%. The dense, homogeneous and crack-free coatings were obtained. Bioactivity evaluation showed that after immersion of the coated samples in the simulated body fluid within the specified time, apatite formed on the surface of the coating increases with increasing immersion time which is adequate proof of bioactivity. Nano-indentation tests also implied an increase in the mechanical properties of the composite coatings, such as hardness and elastic modulus compared with the single-phase hydroxyapatite coating. The results of electrochemical corrosion tests showed that the coatings protect the substrate by creating a mechanical barrier which increases corrosion resistance and reduces susceptibility to pitting. By comparing the effects of adding calcium titanate and barium titanate on the properties of the coatings, it was found that better properties were achieved by barium titanate. The results confirm that hydroxyapatite-calcium titanate and hydroxyapatite-barium titanate composite coatings reveal promising characteristics as candidates to be used for medical applications. Keywords : Hydroxyapatite, Calcium titanate, Barium titanate, Nanocomposite Coating, Sol-gel.