This paper presents the results of an experimental investigation on shear strength enhancement of reinforced concrete deep beams externally reinforced with fiber reinforced polymer (FRP) composites. A total of sixteen deep beam specimens of size 150x350mm and 700mm long were cast. Eight beams of Set-I for Glass fiber reinforced polymer (GFRP) out of eight one as control beam and seven as retrofitted using Glass fiber reinforced concrete and Eight beams of Set-II one as control beam and seven retrofitted using Carbon fiber reinforced polymer (CFRP) as an external reinforcement is used extensively to address the strength requirements related to flexure and shear in structural systems. Two composite systems namely glass fiber reinforced polymer (GFRP) and carbon fiber reinforced polymer (CFRP) were used for retrofit evaluation. A comparative study of the experimental results using FEA software ANSYS and identify the influencing factors on the shear behavior of FRP strengthened reinforced concrete deep beams. Experimental results indicated that substantial increase in ultimate strength of strengthened beams as compared to the control beam specimen. The shear span-to-depth ratio (L/d) is an important factor that actively controls the shear failure mode of beam and consequently influences on the shear strength enhancement. Glass fiber reinforced polymer (GFRP) and Carbon fiber reinforced polymer (CFRP) as an external reinforcement is used extensively to address the strength requirements related to flexure and shear in structural systems.