The first room‐temperature two‐dimensional heavy hole exciton red shift, greater than 25 meV due to the exchange of Van Hove‐typeM1and quantum well excitons, was observed by photocurrent measurements in molecular beam epitaxy grown superlattices with periods of 30 A˚ GaAs/25 A˚ Ga0.5Al0.5As. At a photon energy of 1.66 eV, a 3000 cm−1absorption change due to the blue shift of the superlattice absorption edge was also observed at room temperature in superlattices with periods of 20 A˚ GaAs/20 A˚ Ga0.5Al0.5As.