Nanoparticles are used extensively in a variety of fields, including medicine, sensors and catalysis. One of the major efforts to achieve chemical sustainability is the development of more direct catalytic methods for the synthesis of chemical compounds. The use of nanoparticles with an average size of 1-100 nm as catalysts for a range of catalysis applications is known as nano-catalysis and it is a popular area of research. Due to their high reactivity, sustainability, ease of recovery, frequent recyclability, metallic nanoparticles have recently been used extensively as alternative catalysts in the organic synthesis. The high reactivity of nanoparticles is due to their large surface area, which most definitely affects the reaction rate. Here, we have focused on application of Silver and Gold nanoparticles in the field of catalysis.