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Room‐temperature measurement of nonlinear transmission in (Cd,Zn)Se/ZnSe single quantum wells is reported. Changes in absorption near the band edge due to optically excited carriers were measured for two samples with different well widths as a function of wavelength and intensity. The change in absorption occurred at the n=1 and n=2 heavy‐hole excitons, as well as in the continuum states above the band edge. The peak values for change in absorption are -7000 cm-1 at 10 kW/cm2 for the narrow well and -8000 cm-1 at 50 kW/cm2 for the wide well. Change in refractive index was calculated from the absorption results. Saturation intensities for the excitonic absorption were 13.3 kW/cm2 for the 7.5 nm well and 2.7 kW/cm2 for the 15 nm well. The data show spectra and carrier densities that are consistent with phase‐space filling as the predominant mechanism for absorption change, in agreement with low‐temperature results.