The inhibition corrosion of mild steel in 1 M HCl medium by hydroxyapatite (HAP) was investigated using potentiodynamic polarization curve and electrochemical impedance spectroscopy. The obtained results showed that the HAP has good corrosion inhibition properties for mild steel in acidic medium and its inhibition increase with concentration and reaches a maximum of 90 % at 10-3 M. in addition, the impedance diagrams showed one capacitive loop attributed to the charge transfer process on a heterogeneous surface for all concentrations of HAP. However, the adsorption of this apatite at the metallic surface is a physisorption type and follows the Langmuir isotherm adsorption. In the other, the HAP takes its performance at the temperature range 298 K- 328 K and increases with immersion time.