If you want to stay in the Netherlands for longer than three months and you are not an EU/EEA or Switzerland citizen, you need to apply for a verblijfsvergunning (residence permit).
To obtain a residence permit, you will need to contact the Immigration and Naturalisation Service (Immigratie- en Naturalisatiedienst – IND). Please note that the requirements for a residence permit are dependent on your personal situation and circumstances. You will also find details on: ind.nl/en/stay-or-live-in-the-Netherlands.
Diplomats and international organisations’ employees obtain a special residence document, which is issued by the Ministry of Foreign Affairs (Ministerie van Buitenlandse Zaken). These are for people who are working on Dutch soil as a diplomatic or consular official, or who are employed at an international organisation. They enjoy a special ‘privileged’ status, are not considered foreigners under the auspices of the vreemdelingenwet (immigration law) and are entitled to a special residency status by law. Check out the protocol guide for international organisations published by the Ministry of Foreign Affairs.