The main languages of instruction at YTU are Turkish and English. Although no certificates are required, incoming students are expected to have medium proficiency in the language of instruction of the hosting department.
The language of instruction of the undergraduate and graduate programmes offered by the same department can be different and most of the graduate courses may be offered in Turkish. When in doubt for the language of instruction, please contact the departmental coordinator.
Language of instruction of undergraduate* programmes can be found here: https://ogi.yildiz.edu.tr/duyurular/Fak%c3%bclte---B%c3%b6l%c3%bcm---Program-Bilgileri/324
*Some of the programmes on the link above are at least "30% English." This means that most of the courses offfered by that programme will be instructed in Turkish and there will be a number of courses instructed in English.
Language of instruction of graduate** programmes can be found:
Institute of Social Sciences:
Master: https://sbe.yildiz.edu.tr/page/Programs/MA-Programs/253
Doctorate: https://sbe.yildiz.edu.tr/page/Programs/PhD-Programs/254
Institute of Science and Engineering:
Master: https://fbe.yildiz.edu.tr/page/DEPARTMENTS/MSc--PROGRAMS/136
Doctorate: https://fbe.yildiz.edu.tr/page/DEPARTMENTS/Ph-D--Programs/59
** If he language of instruction is English, it is stated in parentheses on these web pages.