As far as I know, most universities and colleges in English-speaking countries require proof of English language proficiency, and the IELTS exam is one of the most commonly accepted tests for this purpose. However, some universities may accept alternative language proficiency tests, such as the TOEFL or Cambridge English exams.

There may also be universities that do not require English language proficiency tests for admission, but these are likely to be the exception rather than the rule. It’s important to note that even if a university does not require IELTS or another language proficiency test, they may still require proof of English language proficiency through other means, such as interviews or written statements.

In any case, if you are interested in applying to a specific university or college, it’s important to check their admission requirements directly to determine whether they require or accept IELTS or other language proficiency tests. The specific requirements may vary depending on the institution and the program you are interested in, so it’s always best to check with the university or college directly.