Since the Covid-19 pandemic, the tourism sector has been severely affected with a high decrease in its activities. This sector, as well as all services, is looking for a way to adapt to the new market with new strategies and generate new value propositions in activities. Therefore, over the years, Lean Methodologies have been used as a solution for continuous improvement and to face new challenges. This research has posed the following question: What is the effect of applying the lean methodology in service operations offered by the tourism sector globally? The type of research has been developed with a systematic literature review of one hundred and twenty-six (126) articles published between 2017 and 2021. These articles were selected based on keywords related to Lean methodologies in the tourism sector. The results show that applying Lean methodologies allows for an increase in efficiency, a decrease in production and service time, a focus on the value chain, and an increase in customer satisfaction and empowerment of employees.