Nanoparticles (NP’s) have attracted material science researchers due to their distinctive properties and diverse applications. These materials have firmly occupied their space in various disciplines like chemistry, material science, physics and engineering. Preparatory method for nanoparticles can be chemical, physical or biological using bottom-up or top-down approach. A lot of developments were made in last couple of decades in synthetic methods for nanoparticles. The present review mainly covers important chemical, physical and biological methods for nanoparticles synthesis.