Over the past several years M.I.T. faculty, staff, and students have produced a substantial body of research and analysis relating to the production, conversion, and use of energy in domestic and international markets. Much of this research takes the form of models and associated data bases that have enduring value in policy studies (models) and in supporting related research and modeling efforts (data). For such models and data it is important to ensure that the useful life cycle does not end with the conclusion of the research project.In an effort to develop a mechanism for supporting the maintenance and appropriate access to Energy Laboratory associated models and data, the Laboratory's Center for Energy Policy Research (CEPR) has sponsored a project to prepare this Energy Laboratory Data and Model Directory, edited by Dr. Supriya Lahiri and Ms. Jacqueline Carson. The Directory provides a survey of selected models and data bases and includes descriptive information, current status, mode of access, and contact persons. This directory represents the conclusion of this project.