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Hydroxyapatite (HA) is a biomaterial that is widely used for bone implantation because it is bioactive and biocompatible. To improve the bioactive and biocompatible properties of hydroxyapatite, natural ingredients are used as a calcium source. In this study, the material used for calcium source is from paddy field snail shells. Snail shells produced from the process of boiling, cleaning, and drying calcined at a temperature of 800C for 3 hours to obtain the powders. Calcium phase and calcium content of the powder was identified using x-ray diffractometer (XRD) and atomic absorption spectroscopy (AAS). The results of the analysis showed that the calcium phase of the snail shell is Ca(OH)2 with calcium content of 52.12%. Synthesis of HA was carried out by precipitation method at 75C by dripping H3PO4 into calcium solution and continued with two treatments, with and without sintering process. The powders were then characterized by XRD and FTIR. The results of the analysis showed that HA formed in samples that using sintering process and carbonate apatite appears in samples without sintering process.