The purpose of the study was to determine the relationship between teacher quality and learners performance in different subjects in Kenya Certificate of Secondary Education examination Mathioya, Kenya. The study used qualitative and quantitative designs. The research population was 114 teachers and a sample of 90 teachers was used. Purposive and Stratified sampling was used. Data collection used questionnaires for teachers the schools who participated in the study. Findings indicated that there is significant relationship between teacher quality and students’ performance. This showed teacher experience, qualification and the motivations had direct relationship with performance of students in different subjects. Study recommended that Government provide facilities in schools for teachers to teach in conducive environment in order to enhance performance in different subjects.