International students from countries where English is not the primary language must take the Test of English as a Foreign Language (TOEFL). Students who achieve score of 580 or higher on the paper-based test or 237 or higher on the computer-based test will be given regular admission provided their academic background is satisfactory. All international students whose TOEFL scores are lower than 580 on the paper-based test or 237 on the computer-based test will be given provisional admission provided their academic background is satisfactory.

Prior to registration for courses, they will be evaluated for English language skills by Catholic University's Intensive English Program. Depending on the results, students may be required to take intensive classes in English to strengthen their skills. Subject to the approval of their academic adviser, students can take intensive English classes concurrently with a reduced number of School of Engineering graduate engineering courses. Upon satisfactory completion of any required intensive classes in English, students will be given regular admission.