This paper draws from a study conducted on the Influence of Selected Working Conditions on Teachers’ Commitments to their Professional Roles in Public Secondary Schools in Njoro Sub- County, Kenya. . This paper focuses on instructional materials and resources on teachers’ commitment to their professional roles in public secondary schools in Njoro Sub-County, Kenya. The study anchors on Hertzberg Two factor theory which postulates that motivation comprises maintenance and motivational factors. This theory recognizes work environment as a motivator of employees and influences on employee job satisfaction and commitment. Questionnaires were applied to collect data. Data was obtained from 60 Heads of Department and 88 class teachers employed by the Teachers’ Service Commission. Descriptive and inferential statistics was used to analyze data. The study established that adequate instruction materials have a significant bearing on the commitment of teachers among other factors. To this end, the study recommends the need to consider the provision of adequate teaching and learning facilities to schools based on contextual evidence.