This investigation focused on comparative study on the relationship between Public Secondary Schools learning environment and students’ learning outcomes in Nyamagana district. The study involved 101 respondents who are students, and District educational officer, form six leavers’ and parents. Simple random sampling was used to get the number of students and purposive sampling was used to get head of schools, District Educational Officer, form six leavers’ and parents. Questionnaires, documentary review and focused group discussion methods were used to get data from the informants. Both qualitative and quantitative approaches were used to analyze the collected data. This study sought to assess the relationship between learning environment and students’ learning outcomes in public secondary schools, to examine the extent learning environment act as causal agent for poor achievement of students in public secondary schools, to investigate the impacts of school climate, classroom and out of classroom climate, social background and organization climate towards students achievements and academic excellence in public secondary schools .The researcher found that most of public secondary schools operating with no conducive learning environment hence students’ outcomes are poor since there is no created environment for learning process. This study recommended that government should ensure that it fulfills its duty such as provision of enough teaching and learning materials, building teachers’ houses, classrooms should be built matching the state standard, heads of school should be appointed with care and trained as well as involving community to the school operations.