This research aims at investigating the relationship between learner autonomy including technical, psychological, political, and sociocultural and language proficiency of Indonesian university EFL learners. Forty second-year undergraduate students majoring in English in a public university in Indonesia participated in this research. The data were collected through a learner autonomy questionnaire and English language skills scores. The outcome of the research showed that the variables in this research model had a very good relationship. In addition, the results of hypothesis testing indicated that the technical, psychological, and political variables had a positive and significant effect on English proficiency, while the sociocultural variable did not show either a positive or a significant influence on English proficiency. The finding suggested that both teachers and students should be aware of the important roles of learner autonomy to improve English proficiency. In addition, it mandatory to equip students with learner training to become learners that were more autonomous.