Strategy management is crucial for organisational success, but the relationship between strategy management and performance remains unclear. In the context of public secondary schools in Kenya, the Ministry of Education has directed schools to develop and implement strategic plans. However, some schools face challenges in their strategy management. This study aimed to examine the impact of strategy implementation on academic performance in public secondary schools in Bungoma County, Kenya. The study population included 258 principals, 1,290 heads of departments, 258 bursars and quality assurance officers from 258 public secondary schools in the county. Data were collected through questionnaires, interviews, and document analysis. The results indicated a strong positive relationship between strategy implementation and academic performance in public secondary schools. It is concluded that schools that successfully implement strategies to improve education outcomes are more likely to achieve higher academic performance than schools that do not. Recommendations of the study are that streamlining strategy formulation, implementation, and evaluation processes in public secondary schools, enforcing policies to enhance education quality and access, and empowering schools to develop tailored strategic plans are highly encouraged. These findings can inform the Ministry of Education and other education stakeholders in improving policies and practices related to strategy implementation and academic performance in secondary schools