I was pretty sure I’d seen at least three organisations claiming to be “the leading TEFL course”, so spent 20 minutes or so on Google trying to find out how many there were. Not as many claims as I expected, actually, but still far too many to be true. Also no evidence given by any of them…
With biggest claims top, but otherwise no special order:
The world
The largest
“TEFL Greece certification is provided by TEFL International, the largest TEFL training organization in the world”
http://www.tefl.gr/external-moderation.htm
“Get your English teaching certification and job assured with the largest TEFL institute in the world.”
http://www.linkedin.com/pub/tefl-certification/26/393/973 (this one looks like an actual scam)
“Global TESOL, the world’s largest TESOL provider is now being offered in the Philippines.”
http://www.edulynxcorp.com/tesol.php
“International TEFL and TESOL Training is one of the world’s largest TESOL training organizations.”/ “International TESOL Teacher Training is probably the world’s largest TESOL training organization”
http://www.tesolcourse.com/ http://www.facebook.com/pages/Careers-at-International-TESOL-Teacher-Training/78056760515?sk=app_6009294086
“I don’t know if we’re the biggest but we do have a very good reputation in the industry (see link below for independent reviews of our course) and if you go to the ICAL website you’ll see our forum which has over 5,000 ICAL students on it. And there’s also a long list of teaching staff from all over the world which suggests to me that we’re big, if not the biggest since no other TEFL trainer can match that! :)”
http://answers.yahoo.com/question/index?qid=20100612142423AA9GugN
One of the largest/ A leading…
“IH Sydney – TTPC is one of the largest TESOL institutes in the world”
http://www.tesol-ua.org/tefl-courses/australia/celta-sydney-1.htm
“Via Lingua is one of the world’s largest TEFL certificate course providers. With 16 locations across 4 continents”
“International TEFL Academy, one of the world’s largest TEFL certification schools to become professionally trained as an English teacher”
“We are one of the largest TEFL training organizations in the world.”
http://chicago.craigslist.org/chc/sls/3264894300.html
“We currently have 15 members worldwide and we are negotiating with one major TEFL organization who plans to join us in 2013, which will make us one of the world’s largest TEFL organizations”
http://www.worldteflassociation.com/faqs.html
“TEFL Express is a leading provider of Teaching English as a Foreign Language (TEFL) training courses”
UK
“The UK’s leading TEFL course provider”
http://www.theteflacademy.co.uk/
“The UK’s leading TEFL trainer”
“The UK’s leading TEFL course provider”
https://www.gradjobs.co.uk/company-profile/itoi-tefl
“a leading TEFL course provider in the UK”
http://www.teflengland.co.uk/blog/tefl-a-quick-guide
The ICAL TEFL one is definitely the funniest – more on their bullshit coming soon.
TEFLtastic 
LOL. Why didn’t I ever think of doing that! Well, looks like Bruce V and TEFL International have lots of company :-)
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