We have studied the dipole moment and net dipole moment of a series of phenols. The dipole moment of each compound of phenol at x, y and z-axes, and the net dipole moment have been evaluated by the semi-empirical MINDO/3 method. The study has concluded that the magnitude of dipole moment is increased by adding ethyl, isopropyl and methyl alcohol group at ortho position while that of methyl alcohol and azo group at para position and the magnitude of dipole moment decrease by adding methyl alcohol at ortho position of phenol. Thus the substitutions of various groups as well as its position affect the magnitude of dipole moment along the various coordinates.