Micro‐ and millisecond laser annealing of ZnTe monocrystals in a controlled atmosphere shows clearly that oxygen diffuses from an oxygen‐rich atmosphere into ZnTe. In the photoluminescence spectra, the typical red oxygen band is observed after annealing. At 2.360 eV, the intense luminescence line from an exciton bound to a Frenkel pair (VZn,Znint) is found.