The absorption spectrum of Mn2+ions doped in diglycine barium chloride monohydrate (DGBC) has been studied at liquid nitrogen temperature (77 K) in the region λ 6000 Å to 3000 Å. Three of the observed bands showed well resolved fine structure. The splitting of4Eg(G) band is explained as due to exciton-magnon interaction. Weak bands on either side of4A1g(G) band are assigned to phonon progressions withν = 200 cm The fine structure of the4T2g(D) band is analysed in terms of spin-orbit splitting associated with the vibrational frequency of the hydrogen bond (185 cm−1). The observed band positions are fitted with four parameters B,C, Dqand α, and the best fit is obtained with B = 810 cm−1, C = 2980 cm−1, Dq= 760 cm−1and α = 76 cm−1. justify our assumption of octahedral site symmetry for the metal ion in the crystal. From the observed absorption spectrum it is possible to determine the crystal phonons in Mn2+doped DGBC and it is found to be about 200 cm−1.