Carbon nanotubes/hydroxyapatite composites (CNTs/Ca-HA) have been synthesized using catalytic methane cracking. This composite combines the advantageous properties of carbon nanotubes and hydroxyapatite. Carbon nanotubes (CNTs) have attracted increasing attention, thanks to their exceptional physical and chemical properties such as high tensile strength, small density and large length to diameter ratio, good chemical stability and high thermal and electrical conductivities. These properties render them attractive for applications such as reinforcements in various materials. Hydroxyapatite (Ca-10(PO4)(6)(OH)(2), Ca-HA) is a versatile material which can be used in several applications: biomaterials, sorbents for heavy metal fixation from contaminated water, air and soil, catalyst supports. Catalytic methane cracking was carried out in a fixed-bed reactor wherein CH4 gas passed through a heated nickel-loaded Ca-HA bed (Ni content: 5wt.%). The reaction significantly took place at 700 degrees C leading to the formation of CNTs. Reaction parameters such as temperature, methane flow rate and reaction time were investigated. The results presented propose a new approach for CNT/Ca-HA composite synthesis, in regard to the state of the art.