Always ask for approval when considering an internship.
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Arthur D Little 
An internship in Arthur D little means an internship in high-pressure client-driven environment. Here, the intern can show its intellect, curiosity, creativity and enthusiasm while learning about strategy consulting.
More information about the internship itself, like duration and the application procedure, can be found on the website linked above. 

Bain & Company
This summer internship programme helps you learn about the consulting industry and teaches business strategies. After a week of training, you will receive your own case, in which you will actively work together with other consultants and customers, in order to create accurate strategic recommendations. 
More information about the internship itself, like duration and the application procedure, can be found on the website linked above. 

BMC 
(Dutch only) BMC offers traineeships within the public sector, in many different sectors. During this traineeship you will work for 36 hours a week, plus eight hours education. You will get knowlegde of public administration and get trained as a advisor, by combining practising theoretical knowlegde and skills. 
More information about the internship itself, like duration and the application procedure, can be found on the website linked above. 

Boston Consulting Group 
BCG helps to tackle important challenges in society and business by giving advices and helping to enhance and create business strategies . On their website it is posible to apply for internships, as well as fultime jobs all year long, and at places all over the world.
More information about internships, like duration and the application procedure, can be found on the website linked above. 

Deloitte Netherlands
Deloitte Netherlands is one of the biggest companies in the area of financial and accoutancy services.  They have many different internships and traineeships, which can be done during your bachelor, masters or after studying. 
More information about internships, like duration and the application procedure, can be found on the website linked above. 

KPMG
KPMG is a global network consisting out of various accounting and consultancy firms. Together with clients to work towards growth and technological developments. Through the year, the have many rolling admissions for internships, traineeships and working-internships. 
More information about internships, like duration and the application procedure, can be found on the website linked above. 

McKinsey & Company, Netherlands
McKinsey & Company is a consultancy firm, which advises many public and private organizations. They hae two diferent types of internship programmas, which often last for 8-10 weeks and can take place all around the world. Within these programmes you will be part of a small team and together you will work on a certain project.
More information about internships, like duration and the application procedure, can be found on the website linked above. 

Strategy&
During one of their 3-months internships, you will learn more about consulting and  how to work together with clients, as well as colleagues. . As an intern, you will be part of an (international) project, through which you will obtain practical skills, while working in this business. More information about internships, like duration and the application procedure, can be found on the website linked above