A) Remember terms "[ W_O & I_O ]"--- GENEVA, SWITZERLAND
================================================
If any organization starts with "WORLD / INTERNATIONAL & ends with ORGANIZATION their headquarters in Geneva,Switzerland..

[ W_O]
-----------
1)WORLD Intellectual Property ORGANIZATION [ WIPO ]
2)WORLD Health ORGANIZATION [ WHO ]
3)WORLD Meteorological ORGANIZATION [ WMO ]
4)WORLD Trade ORGANIZATION [ WTO ]

[I_O]--[ Except IMO ]
-------------------------------
5)INTERNATIONAL Labour ORGANIZATION [ ILO ]
6)INTERNATIONAL Committee for Red Cross ORGANIZATION [ ICRCO ]
7)INTERNATIONAL Standardization ORGANIZATION [ ISO ]
8) United Nation Conference on Trade And Development [UNCTAD]

Name Starts With International and End with Organization Except IMO their headquarters in Geneva,Switzerland Whereas IMO[International Maritime Organization ] head quarter in LONDON , UK [ see below trick for London Organizations ]
ISO[ International Organization For Standardization ] For our Convenience i exchanged words in NO.7
B) Remember term I AM COMMON man in---LONDON
=========================================
9) I for International Maritime Organization [ IMO ]
10) AM for AMnesty International
11)COMMON WEALTH of Nations
12)COMMON WEALTH Telecommunication Organisation

C) WASHINGTON DC
=================
If Any Organisation related to International Money Monetary Organisation their Headquarters in WASHINGTON DC We have Two International Money Monetary Organisations they are IMF & WB
13) International Monetary Fund [ IMF ]
14) World Bank [ WB ]

D) Remember term INDUSTRIES like ATOMIC & PETROLEUM---VIENNA AUSTRIA
================================================== ====
If any organization related to Industrial Development like Atomic & Petroleum their headquarter in Vienna, Austria They are

15)United Nations INDUSTRIAL Development Organization [ UNIDO ]
16)International ATOMIC Energy Agency [ IAEA ]
17)Organization of the PETROLEUM Exporting Countries [ OPEC ]

E) Remember term UN CHILD EMERGENCY in NEWYORK
============================================
18) UNITED NATION Organization [ UNO ]
19) UNITED NATION International CHILDREN EMERGENCY Fund [ UNICEF ]

F) Remember term ECONOMIC & EDUCATIONAL in PARIS
============================================
If any organization related to Economic & Educational their headquarter in PARIS

20) Organization for ECONOMIC Co-Operation Development [ OECD ]
21) United Nations EDUCATIONAL, Scientific and Cultural Organization [ UNESCO ]

G)SINGLE HEADQUARTER ORGANIZATIONS
===================================
22) ASIAN Development Bank [ ADB ]--MANila, Philippines [ ASIAN MANila ]

23 ) Association of South East Nations [ ASEAN ]-- JAKarta, Indonesia [ ACE JACK ] --Remember Playing cards

24) FOOD Agriculture Organisation [ FAO ]--Rome, ITALY [ FOOD IDLY ]

25) International COURT of JUSTICE-- The HAGUE, Netherlands [ Remember COURT given JUSTICE HANGUE ]

26) South Asian Association For Regional Cooperation [ SAARC ]--Khatmandu, Nepal


Copied from a website Vasmi Krishnas Post. Credit goes to him