Most countries are represented with Embassies in the Netherlands and cluster around Amsterdam and The Hague. The Embassy World webpage has a comprehensive listing of all Embassies in The Netherlands. In all, some 42 countries are represented in The Netherlands.
United Kingdom
website - http://www.britain.nl
Lange Voorhout 10, 2514ED, Den Haag
New Zealand
website - http://www.nzembassy.com/default.cfm?i=26
Carnegielaan 10, Level 4, 2517KH, Den Haag
United States of America (Embassy)
website - http://netherlands.usembassy.gov
Lange Voorhout 102, 2514EJ, Den Haag
United States of America (Consulate)
website - http://netherlands.usembassy.gov
Museumplein 19, 1071DJ, Amsterdam
Note
The U.S. embassy provides limited services to U.S. citizens. For routine matters such as passport renewals, birth reports and assistance in a crisis (legal or otherwise) the place to go is the U.S. Consulate General. They are located in Amsterdam at the address listed above. The Consulate has rather limited hours for American Citizen Services, so please check the website before you make the trip.
South Africa
website - http://www.zuidafrica.nl
Wassenaarseweg 40, 2596CJ, Den Haag
Australia
website - http://www.australian-embassy.nl
Carnegielaan 4, 2517KH, Den Haag
Canada
website - http://www.international.gc.ca/
Sophialaan 7, 2514JP, Den Haag
India
website - http://www.indianembassy.nl
Buitenrustweg 2, 2517KD, Den Haag