The purpose of this research paper is to designing a interface of Bengali in Koha for libraries. Data entry is possible in Bengali language of different item types including Books, Monographs, Journals and etc. Create a new bibliographic framework for this items in different modules. Translate all the folders under the Koha modules like cataloguing, circulation, acquisition, authority control, member generation and report generation. Apart from this it also translate the OPAC interfaces in Koha for the users in libraries. This framework is very helpful for the libraries including academic, public and research libraries also. Retrieved the right information of any Bengali term which available in Koha. New windows will appear just click on the Bengali language option in Koha. It can be access from the single window based interface just click on the desktop icon.