ABSTRACT Motivation is argued to be a critical predictor of language learning success, but it is not clear whether motivation is equally relevant across compulsory and optional language education contexts. This study explored the motivation of adolescent Anglophone students of other languages across secondary school year groups with a particular interest in the impact of choice and curricular structure. Based on Self-Determination Theory, we developed a model that maintains that perceptions of autonomy support predict learners' sense of autonomy, in turn enhancings motivation. Through a survey of 1775 students aged 11-16, we tested whether this model holds for learners from different year groups, and in later years, across those in schools with and without mandatory language education. We found that all learners reported less autonomy frustration and were more likely to report a more autonomous form of language learning motivation if they perceived their language teacher as autonomy-supportive, but that as learners progressed through school perceptions of autonomy support declined. Further, we found that motivation was strongly associated with curriculum policies providing choice. These differences in motivational profiles across year group have implications for how teachers might support students' across different years and for programmatic adaptations that might facilitate students' learning.