This paper presents an experimental and numerical study on the effect of fiber-reinforced polymer (FRP) sheets/laminates on the flexural deflection of pre-cracked and repaired reinforced concrete (RC) beams. The experimental program was aimed at studying the carrying capacity of repaired beams through load-deflection curves along with failure modes which can occur in unrepaired and repaired RC beams. The types of FRP reinforcement (CFRP sheet, GFRP sheet and CFRP laminate) and the number of FRP layers were selected as two main parameters in the test program. The major code models, namely Eurocode 2, the ACI-318 and the BS-8110 are used for evaluation of ultimate moment, and the results are also compared with experiments ones. Finite element analysis (FEA) using ANSYS software is presented to predict the load-deflection behavior of the RC beams, and completed with a numerical analysis to assess the interfacial shear stresses, focusing on debonding failure. The experimental results show an improvement in the ultimate load capacity of repaired RC beams with FRP ranging from 13% to 100%, with lower mid-span deflections ranging from 15% to 35% as compared to the control beam (without FRP). On the other hand, the major code models could not accurately predict the moment capacity of RC beams strengthened with FRP sheets/laminates, with a gap closer to 1.40. Moreover, the numerical FEA predictions show a good agreement in the load-deflection response for all tested beams. Also, the numerical analysis results indicate that the shear stresses rise with the number of FRP sheets layers.