Abstract: Silica nanoparticles (SiO2 NPs) have found applications in many advanced biomedical fields. This research work is concerned with the preparation of amorphous silica nanoparticles by the hydrolysis of tetraethyl orthosilicate (TEOS) in ethanol medium and different surfactants such as cetyltrimethylammonium bromide (CTAB) and polyvinylpyrrolidone (PVP) and study the final properties of the prepared silica nanoparticles. The synthesized nanoparticles were systematically characterized by XRD, FTIR, particle size analysis and TEM. The XRD results revealed the crystallinity of silica nanoparticles. FTIR spectroscopy confirmed the presence of Si-O in the sample. The data obtained from DLS showed that particles with size of 198 nm had prepared. Moreover, the cytotoxicity of blanked silica NPs and Doxycycline Hyclate (DOX) loaded silica NPs on Human bone osteosarcoma cells (Saos-2) was evaluated by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. The results approved that the fabricated Silica nano particles are biocompatible and have the potential to be a convenient drug carrier.