The present study deals with the FTIR and Laser Raman Spectrum of 1,2-dichloro-4-fluoro-5- nitrobenzene which have been recorded in the region 4000-400 cm-1 and 4000-50 cm-1 respectively. Both the spectrum have been analyzed on the basis of Cs point group symmetry and the observed bands have been assigned to the different specific modes of vibrations. The assignment of FTIR and Laser Raman bands of the said molecule are made on the basis of magnitude and relative intensities of the observed bands. The assignment made for complex molecule under investigation are in good agreement with the earlier work on some benzene derivatives.