The International Taekwon-Do Federation (often just called the ITF) is an organisation* originally set up in 1966 by Choi Hong-hi, the founder of Changheon-yu Taekwondo, to promote and coordinate Taekwondo worldwide.
* At present, however, there are three separate organisations that use the name ‘International Taekwon-Do Federation’. The original International Taekwon-Do Federation split after Choi died in 2002. Each claims to be the genuine ITF:
International Taekwon-Do Federation (United Kingdom), headed by Choi Jung-hwa
http://www.itf-administration.com/
International Taekwon-Do Federation (Vienna, Austria), headed by Ri Yong-son
https://www.itf-tkd.org/
International Taekwon-Do Federation (Benidorm, Spain), headed by Pablo Trajtenberg
http://www.taekwondoitf.org/
There are a number of other organisations that have split from the ITF, but which don’t use the name ‘International Taekwon-Do Federation’. Notably, these are:
Global Taekwondo Federation (Ontario, Canada)
http://www.gtftaekwondo.com/
Unified International Taekwon-Do Federation (Connecticut, United States)
http://www.unifiedtaekwondo.com/
There are also a number of other international organisations that promote Choi’s style of Taekwondo – Changheon-yu – notably among which are:
Taekwon-Do International
http://www.tkdi.biz/