Does Tsinghua University require the ACT for undergraduate admission?

No. Tsinghua University does not require the ACT specifically for undergraduate admission as an international student.

What matters is the exact undergraduate program and the current year’s international admissions instructions. Tsinghua’s international applicant requirements are usually published through its undergraduate admissions or International Students Office pages, and they often focus more on school transcripts, graduation credentials, language proficiency, and program-specific academic qualifications than on one single U.S. test.

If you are applying with a U.S.-style high school background, an ACT score can sometimes be submitted as part of your academic profile, but it is generally better understood as one possible credential rather than a mandatory one.

The main thing to verify is whether your intended major has extra requirements, especially for programs taught in Chinese versus English. Chinese-taught programs commonly require HSK results, while English-taught options may require TOEFL or IELTS if your schooling was not in English.