Proficiency in English is an admission requirement for most master’s programmes. You will need to submit proof of proficiency of English as part of the admission process to Leiden University, preferably by means of an IELTS test. In most cases Dutch students with VWO level English are also exempted (please check programme description). Leiden University only accepts English language test results that are no more than two year old.
Detailed information on the requirements and the exemptions can be found on the prospective student site