The existence of board teachers to curb teacher shortage in public secondary schools is common in Kenya. There is however scanty empirical evidence on the particular roles of principals towards these cadre of teachers. This study thus focused on assessing the roles of principals as managers of board teachers. It employed a survey research design and the target population was 216 respondents: comprising of 23 principals, 23 board chairpersons and 170 board teachers. Sample size was calculated using Krejice and Morgan's Sample size table and thus a sample of 20 principals, 20 board chairpersons and 118 board teachers was obtained giving a study population of 158. Simple random sampling was used to select study samples. Data was collected using structured questionnaires administered to board teachers and structured interviews administered to principals and board chairpersons. Reliability analysis was done using Cronbach’s Alpha Coefficient found to be 76.4%. Validity was ascertained through expert judgement where the computed Content Validity Index was at 0.9. Responses were coded using Statistical Package for Social Science for windows version 25. Quantitative data was analyzed using descriptive statistics while qualitative data was subjected to content and thematic analysis. Analysed data was presented in form of frequency tables. The study findings showed that principals’ roles in relation to teachers employed by school boards include recruitment, induction and monitoring availability of funds to pay salaries. However, the approaches of performing these roles differ from one school to the other depending on the school system and availability of resources. The study recommended that the Ministry of Education at the sub-county level should have a database that tracks the number of board teachers and their salary scales.