Using a model similar to that of Smith [4] the orbital g‐factor gorb. of the excited state of F‐centres in LiF, LiCl, NaF, NaCl, KF, and KCl was calculated. The results are quite sensitive to the particular envelope wavefunction chosen for the F‐centre. Gourary and Adrian type II wavefunctions lead to results which are in good agreement with the available experimental values.