Highly Transparent Nickel Oxide (Nio) Thin Film Was Depositedonto the Glass Substrates By Using Simple and Economic Chemical Spray Pyrolysistechnique. Aqueous Solution of Nickel Chloride () Was Used As a Precursor Solution. Theprecursor Solution of Molarity 0.5 M Was Sprayed Through Glass Nozzle Onpre-Heated Glass Substrate. the Substrate Temperature Was Kept Constant at 400°C During the Film Deposition. Optical Property of Prepared Film Was Studied Bymeans of Uv-Visible Spectrophotometer In the Spectral Range 300-900 วบ. Opticalstudy Revealed the Excellent Optical Transparency of Nio Film. Average Transparencyabove 80% Has Been Observed In the Entire Visible Region Which Offered a Strongcandidature For Thin Film Based Coating Applications.