Cashew Nut Shell Liquid mainly contains phenolic constituents such as anacardic acid, cardanol and cardol. Cardanol contains polymerizable side chain and phenolic group. Cardanol and its various derivatives have found numerous industrial and medicinal applications. This research paper deals with the synthesis and characterization of diazotized resins synthesized from renewable source cardanol. p-chloroaniline and p-nitroaniline have been diazotized and coupled with cardanol to prepare diazotized p-chloroaniline cardanol dye and diazotized p-nitroaniline cardanol dye respectively. Further, both the dyes have been condensed with furfural and followed by urea separately in order to get the desired diazotized resins. The resins have been characterized by Ultra violet-Visible spectroscopy, Fourier Transform-Infrared spectroscopy and 1H-Nuclear Magnetic Resonance spectroscopy techniques. Also antibacterial activity for the diazotized resins have also been investigated and discussed in detail.