The viability of using post-installed near-surface-mounted carbon fiber reinforced polymer (NSM-CFRP) composite strips to restore and upgrade the shear capacity of reinforced concrete beams pre-failed in shear is examined in this paper. The study comprised testing of 12 specimens. Test parameters included the amount of internal steel stirrups, angle of inclination of the post-installed NSM-CFRP composite strips, and presence of shear-damage prior to retrofitting. The shear-damaged beams were first tested to failure, retrofitted, then retested to failure for a second time. Test results demonstrated that rehabilitation of RC beams pre-failed in shear with the NSM-CFRP composite strips fully restored the beam shear strength. The shear capacity of the pre-failed beams after retrofitting was even higher than the original shear strength recorded in the first shear test to failure. The strengthening effectiveness decreased with an increase in the amount of internal steel stirrups. The inclined NSM-CFRP composite strips were more effective in improving the shear capacity than the vertical strips.The validity of an analytical approach published in the literature to predict the NSM-CFRP shear resistance has been demonstrated by comparing its predictions with the experimental results.