The admission procedures for the Graduate Schools are given on the various websites. Although each Graduate School has its own admission procedure, you must in any case:

• have been awarded a master’s degree or an equivalent master’s degree from another institution, or who have passed the ‘old style’ doctoral (doctoraal) examination of a government-funded or appointed Dutch university.
• give the name of a professor (or associate professor with ius promovendi*) at Leiden University who is willing to be your supervisor. 
• have a second supervisor. This can be either another professor (supervisor) or a co-supervisor with a PhD, in either the same or a different faculty. If you have not already found a second supervisor, the dean will appoint a co-supervisor, to ensure that you are supervised by at least two individuals.

Non-Dutch degree

If you have a degree from a non-Dutch university, your certificate will first have to be verified. After this, the dean will decide whether you can be admitted to the PhD track.