This research investigates the factors influencing undergraduate students' interest in learning English at a public university. A quantitative methodology was used, with 250 students completing a 27-item Likert scale survey. The survey measured motivational factors, concerns, confidence, learning processes, benefits, attitudes, and self-regulation. Participants found it easy to participate because of the university's diverse student population and the researchers' affiliation. Questionnaires were distributed in class, with explanations in both Khmer and English to ensure clarity. The study revealed the impact of intrinsic and extrinsic motivation on English language learning in the Cambodian context. Recommendations are provided to assist educators and policymakers in improving motivation strategies and students' language proficiency for academic success.