Objective: This study examines how the learning environment and students’ learning motivation impact academic achievement among the state junior high school students in Merauke District, Southern Papua Province, Indonesia, with a specific focus on Indonesian Language Subjects. Method: Utilizing a quantitative approach and employing a survey research design, data were collected from 335 students across various state junior high schools. Gathered data were subjected to a rigorous statistical analysis using simple and multiple linear regression analysis. Findings: The findings show that school environment and learning motivation impact significantly positively the academic achievement of the state junior high school students in Indonesian Language Subjects, both partially and simultaneously. Implication for Practice and Research: The findings underscore the pivotal role of a conducive learning environment and heightened student motivation in bolstering academic achievement. The findings of this study contribute valuable insights to educators and policymakers, highlighting the importance of creating supportive learning environments and implementing strategies to enhance student motivation, ultimately leading to improved academic outcomes in the Indonesian educational context.