The term institutionalization is a process that necessitates change and harmony with the environment and provides value and balance to establishments. The tourism industry plays quite an important role in the economic development of all countries. Therefore, the phenomenon of institutionalization is considered a strategic management system for tourism establishments to adapt to intense competition conditions, make a profit and sustain their existing share in the market. The purpose of this study was to measure the level of institutionalization perceived by 368 persons working at 50 five-star hotels operating in Antalya. Descriptive statistics were utilized in the study, with factor analysis, t-test, and ANOVA test. As a result of the analysis performed, it was found that the participants' perceptions on formalization, professionalization, cultural power, and consistency vary in accordance with the variables of total employee number, bed capacity, and time in the business of the hotels where they are employed.