EU or EEA Citizens do not need to secure a visa if they intend to work or get an internship in  the Netherlands. However if you will be staying for more than 4 months, you are already obliged to register with the local municipality. If you are a third-country (non EU/EEA) you will have to apply for the relevant Schengen visa that will allow you to do an internship in the country. Your employer will have to secure you a combined work and residence permit to be able to proceed with your internship. The following documents may be asked of you:

• Invitation letter or an internship contract from the Netherlands company you will be visiting. The letter should contain their company name, address, accompanied by your dates and purpose of visit.
• Fully accomplished and signed Schengen Visa Application Form
• (2) Two pieces of identical photographs that are no older than three months and taken with consideration to the Schengen Visa Photograph Specifications
• Passport that contains at least two blank pages to be able to affix the Netherlands Visa sticker. Validity of the passport should be 3 months after the date of exit from Netherlands or Schengen territory. The passport should be no older than 10 years as well.
• Bring copies of your previous visa are available
• You will also need a cover letter where you will explain further details about your visit in the Netherlands
• A copy of your round-trip flight itinerary or a reservation ticket going home
• Schengen Travel Insurance copy of confirmation or proof of purchased insurance for travel in the Netherlands and the whole territory of Schengen, with minimum coverage of USD 35,800.
• Accommodation receipts or hotel confirmation that will show where you will stay in the Netherlands for the whole duration of your stay
• Proof of civil status, this may be a marriage certificate, birth certificate, or death certificate of spouse
• Proof of sufficient financial means that will cover your whole stay in the Netherlands
• You may also prepare your 6 months bank account statement as a supporting document

To Apply

1. Collate all your documents and check for other relevant documents that will help prove your ability to sustain  your visit in the country.
2. Look for a local Visa Application service provider who can walk your documents.
3. If there are no service providers, you may submit to the Netherlands Embassy near you. For details on addresses you may click this link here.