Is it possible to apply for UK universities without IELTS?

For the UK, IELTS or other English tests like TOEFL, PTE, or Duolingo are commonly required. However, some universities do offer English language test waivers if you have studied in an English-medium program and can provide a Medium of Instruction (MOI) letter from your university confirming this. In addition, strong Class 12 English scores may also be considered by certain universities while granting a waiver.
So yes, you can apply to some universiities/programs without IELTS or an equivalent English language test.