The aim of the present study is to investigate the factors that inhibit the implementation of subject specialization in Bubi District primary schools. The population comprised all the 1200 primary school teachers and school heads. The sample was made up of 125 respondents who were randomly selected. The study adopted the descriptive survey design and the questionnaire and interview were employed as the research instruments for collecting data. The study established that among the obstacles that inhibited the successful implementation of subject specialization in Bubi District, there was a shortage of subject specialist teachers, there were no specialist rooms to cater for the different subjects offered by the schools. The study also established that there were positive attitudes by teachers towards subject specialisation. The study recommends that teacher training colleges for primary school teachers should produce teachers who are subject specialists and that the Ministry of Primary and Secondary Education should come up with clear policies to promote subject specialisation in the primary school system.