The use of fiber-reinforced polymer (FRP) composites as externally bonded reinforcement (EBR) to repair and strengthen of deficient structures has taken place since the late 1980’s. Continuous efforts in material development and research activities, with strong links to engineering practice, give this application more and more worldwide acceptance. This paper presents an experimental study on flexural strengthening of reinforced concrete (RC) slabs with three different commercially available carbon FRP (CFRP) systems, prefabricated laminate plate, fiber laminate sheet and prefabricated laminate bar, using four different EBR techniques involving cold cured adhesive bonding, prestressing, manual wet lay-up and near surface mounted (NSM) technique. All slabs were tested to failure under simply supported conditions. CFRP EBR increased the flexural strength and reduced the deflections and crack widths of the strengthened slabs. Two modes of failure were observed, debonding and rupture of the CFRP reinforcement. Significant increases in ultimate moment capacity ranging from 63% to 145% were registered in all the strengthening slabs, as compared to the control slab. The slab which was strengthened with NSM laminate bars exhibited the highest efficiency followed by prestressing laminate plates, manual wet lay-up laminate sheet and cold cured adhesive bond laminate plates.