COC Amsterdam
The country’s largest advocate of gay rights provides support to all homosexuals living in the Netherlands. Club COC also organises social events.  
Tel: +31 (0)20 626 3087 
Email: [email protected]  
Website: www.cocamsterdam.nl

Gay Swim Amsterdam  
Organised water polo, diving and competitive swimming at the Sloterparkbad: interested parties are welcome to join, but phone ahead to verify times and any fees which need to be paid.
Tel: +31 (0)6 2417 3268  
Email: [email protected]  
Website: www.gayswimamsterdam.nl

IHLIA
IHLIA is an international gay/lesbian library, archive, information and documentation centre about homosexuality and sexual diversity. Anyone can find here the information they need about gay men, lesbian women, bisexuals and transgenders, their history and culture.
Email: [email protected]
Website: www.ihlia.nl

Love Exiles Foundation / Stichting Love Exiles
The Love Exiles Foundation educates the public about immigration issues facing same-sex couples and provides them with support. The Dutch chapter organises social events and provides a support network for couples moving to the Netherlands. 
Email: [email protected] 
Website: www.loveexiles.org

Police: Amsterdam-Amstelland
The local police department operates a project called 'Roze in Blauw', in which officers with an affinity with the local gay & lesbian community are available to help anyone harassed or discriminated against because of their sexuality.
Tel: +31 (0)20 559 5385 
Website: www.politie-amsterdam-amstelland.nl

Amsterdam Gay Pride Foundation
The official organiser of Gay Pride Amsterdam, as well as other key LGBT events throughout the year.
Tel: +31 (0)6 1479 3189
Email: [email protected]
Website: www.amsterdamgaypride.org