The mean square dipole moments of 1:1 complexes of n-butanol,i-butanol and r-butanol with aniline and pyridine in benzene are determined following two different methods: one uses Onsager's method based on dipole-dipole interaction and the other uses the help of modified Palit's method involving a limiting polarization measurement technique. The interaction dipole moments Δμ for the thermodynamically most favoured geometry of 1:1 complexes of the system involving butanol-aniline and butanol-pyridine were calculated. The value of Δμ indicated that complexation is due to polarization interaction. Furthermore, Δμ is found to be in the order pyridine > aniline. The dipole moment of the complexes involving butanol-aniline and butanol-pyridine is found to be in the order pyridine > aniline. These results have been used in interpreting of the structures of the complexes.