This paper reports on the results of a small-scale survey of the attitudes of instructors of non-language subjects towards the use of English as a medium of instruction in Turkish universities, where Turkish is the native language of the great majority of the students. The sample of this study consisted of 100 instructors at the universities in Ankara in Turkey. The results of the questionnaire, in general, show that Turkish instructors are more favorable to the idea of adopting Turkish as an instructional medium rather than English. They agree that instruction in Turkish can promote student learning better. However, the instructors have a wide range of concerns related to the Turkish-medium instruction as well as the English-medium instruction in higher education such as the resources provided in Turkish and English, the proficiency level of students and student participation in class.