The purpose of the study is to explore the factors affecting the students’ motivation level to learn English as a second language in a public university context of Pakistan. The study falls in interpretive paradigm as this research adopts mixed methods approach where quantitative mode of inquiry leads the qualitative. Quantitative data are collected, from a randomly selected sample of 50 out of a population of 400 undergraduate students, through a structured questionnaire; whereas the qualitative data are generated, from a conveniently selected group of five students, through utilising semi-structured telephonic interview. The quantitative data highlight that there are many factors which affect students’ motivation towards English language learning. These factors include integrativeness, instrumentality (promotion), instrumentality (prevention), international posture, English anxiety, attitudes towards learning English, ideal L2 self, ought-to L2 self, interest in English language, travel orientation, linguistic self-confidence, criterion measures, family and teacher influence, and fear of assimilation. The qualitative data endorse these findings. The qualitative data also revealed a number of other factors including English as an official language, the respect and status associated with the English language, the importance of English for the Pakistani general public and professionals, globalization, international language, the language of international organisations, the media, and science and technology which affect the students’ motivation for English language learning.