The successful functioning of restaurant business organizations largely depends on the state of internal environmental factors. In this regard, it is very important to use a relevant methodology for assessing the internal environment, which ultimately allows us to formulate a successful development strategy. Thus, there is a need to improve the methodology for strategic assessment of factors in the internal environment of a restaurant business organization. The purpose of the study is to develop and test a methodology for strategic assessment of factors in the internal environment of a restaurant business organization. The following methods were used in the study: benchmarking, expert assessments, correlation analysis, SNW analysis, and GAP analysis. The novelty of the conducted research lies in the development of the theory and methodology of strategic analysis of the internal environment, which consist in developing a methodology for analyzing the internal environment adapted for restaurant business organizations. The result of the study is a methodology for strategic assessment of factors in the internal environment of a restaurant business organization, justified from a socio-economic point of view. The authors conclude that the introduction of a new methodology for assessing internal factors improves the quality of the analysis, and, ultimately, the effectiveness of the development strategy of the restaurant business organization.