An experimental investigation of the effects of humidity-induced condensation on shock/boundary-layer\ud interaction has been conducted in a transonic wind-tunnel test. The test geometry considered was a wall-mounted\ud bump model inserted in the test section of the wind tunnel. The formation of a λ-shape condensation shock wave was\ud shown from schlieren visualization and resulted in a forward movement of the shock wave, reduced shock wave\ud strength, and reduced separation. Empirical correlations of the shock wave strength and humidity/dew point\ud temperature were established. For humidity levels below 0.15 or a dew point temperature of 268 K, the effect of\ud humidity was negligible. The unsteady pressure measurements showed that if a condensation shock wave formed and\ud interacted with a main shock wave, the flow becomes unsteady with periodic flow oscillations occurring at 720 Hz.