In this paper we present optical studies of neutral Mn intracenter absorption band in bulk GaN performed in magnetic field up to 22 T in both Faraday and Voigt configurations. The experiment revealed very weak influence of magnetic field on the absorption spectrum. In particular no splitting of the zero‐phonon line was observed. The only characteristic feature in magnetic field was step‐like behavior of the spectral position of the zero‐phonon line, recorded in Faraday configuration. The step appeared at magnetic field of about 7 T with shift in energy of 1.3 meV. The results were interpreted basing on a crystal‐field model for Mn3+(d4) ion in trigonal crystal field, with Jahn‐Teller distortion and spin‐orbit coupling. The model explains reasonably experimental results supporting localized character of neutral Mn acceptor in GaN.