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This question already has an answer here:

I've recently been learning how to use a camera, and was wondering what ISO stood for?

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marked as duplicate by John Cavan, NickM, Itai, MikeW, dpollitt Feb 6 '13 at 23:49

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

ISO doesn't actually stand for anything, it's the chosen short form for the name of the International Organisation for Standardisation. – Guffa Feb 7 '13 at 12:50
See also:… – Rowland Shaw Feb 8 '13 at 12:43

According to the wikipedia article on Film Speed (under the ISO section) it stands for International Organization for Standardization.

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