Is IELTS required for every masters scholarship?

Yes, it is called a Medium of Instruction letter. Plenty of universities in the UK, Ireland and the Netherlands accept one if your whole degree was taught in English. It is never listed on the scholarship page. It is on the university admissions page, under English language requirements. Check there first.

This is right. I got into two programmes with an MOI letter and no test. One thing to add: ask your registrar early. Mine took five weeks to produce it.

Thank you. I looked and my first choice does accept it. That is the test money saved.

Worth saying the opposite too. Some countries need the test for the visa even if the university does not. Germany and Canada both caught people out last year. Check the visa page, not only the university.