Yes, as a general rule, you need TOEFL or IELTS in order to apply for a program that is entirely taught in English at a German university. If, however, you?re applying for a postgraduate program and already hold a Bachelors degree with English as the language of instruction, you do not need TOEFL or IELTS; it goes without saying: no need for TOEFL or IELTS if you?re a native speaker of English.