Purpose of Study: Considering Muhammadiyah’s big contribution to education in Indonesia by establishing thousands of schools, it is thus important to understand the competence and the beliefs of teachers who teach in Muhammadiyah schools. This quantitative study investigated Muhammadiyah teachers’ beliefs and practices of using YouTube in EFL context in all Muhammadiyah Senior High Schools of Surabaya. Employing a survey design, this research aims to describe Muhammadiyah Senior High Schools of Surabaya English teachers’ beliefs and practices of using YouTube in the EFL context. 22 English teachers participated as the subjects of the research. To obtain the data, the instrument used was a questionnaire which is copied and distributed to the targeted subjects. Interview and documentation were done to validate the results of the questionnaire. Results reveal that English teachers in Muhammadiyah Senior High Schools of Surabaya hold positive beliefs about using YouTube in the EFL context. And, despite the only view of them used it often, all the teachers had already used YouTube in their practices of teaching English. Overall, teachers’ beliefs about using YouTube in EFL context were in line with their practices. Methodology: This research applied the quantitative technique and the design employed was survey design. Survey designs are procedures in quantitative research in which investigators administer a survey to a sample or to the entire population of people to describe the attitudes, opinions, behaviors, or characteristics of the population. Creswell continues, “Surveys help identify important beliefs and attitudes of individuals.” Results: The results obtained from the participants were analyzed using an SPSS 17 programmer. Each participant was given a participation alphabet and the data were analyzed using descriptive analysis method. Then, the frequencies and percentages for each statement were presented in tables (see appendixes) Implications/Applications: English teachers in Muhammadiyah Senior High Schools of Surabaya hold positive beliefs about using YouTube in the EFL context.