What is difference between NEBOSH, IOSH and OSHA?

I am NEBOSH certified and when I came to Saudi Arabia for job, I found that most companies are looking for Aramco Certified Safety Officer. I want to know how to become Aramco Certified in Safety without working for Aramco? Also where can I do the course in KSA?

NEBOSH IGC is primarily for those who wish to take HSE as full time career irrespective of their degree background . if you wish to see yourself working on positions like HSE Engineer , HSE officer etc , then NEBOSH IGC is an ideal choice . bear in mind that this course requires significant amount of Money , Time & efforts compared to IOSH Managing Safely . NEBOSH denotes for National Examination Board on safety & Health which is a UK based Examination body who confer Certificates & Diploma in Health & safety to both British & overseas aspirants .whereas IOSH is institution of safety & health of UK , world's largest professional & research based membership body of safety professionals who research & give recommendations to statutory bodies of UK on matters pertaining to health & safety at workplace . OSHA is neither course nor certification . OSHA is regulatory & compliance body of health & safety in America , stands for Occupational safety & health administration which offer10 hours &30 hours awareness classes only for workers on OSHA regulations & standards related to different jobs at workplace for example work at height & excavations . after this training , OSHA issues wallet cards ( similar to credit card ) to ALL participatory workers . since2010 , OSHA is no more issuing any card to trainees outside USA . so people in Pakistan claiming to offer OSHA training are nothing but deception

NEBOSH & IOSH both are british standared while OSHA is Amrican standared.

IOSH is professional certification in occupational health and safety but NEBOSH is more advance.

can you answer my question 

what you recommended to work in UAE ?

I studied food engineering 

OSHA is a part of international standard organisation like iso1,1 

I.O.S.H is a short course which is only definitions .Its also called mini NEBOSH.

NEBOSH is a full course which is every thing mention in this course with detail. 

Must more likely the same with little differences only with hearing standards & paper works . The NEBOSH stands for National Environmental Board of Safety & Health for the commonwealth countries , while IOSH stands for Industrial Occupation Safety and health USA  . OHSA  represents Occupation Safety and health Administration USA