Abstract: Primary school teachers’ pursuit of higher academic qualifications of degrees and diplomas goes hand in hand with upgrading and updating of their skills and abilities, which should be of consequence to the quality of their work performance. The purpose of this study was to examine the influence of primary school teachers’ pursuit of academic advancement on work performance among public primary schools in Mumias West sub county, Kenya. The study was guided by correlational design. The population targeted by the study included 846 primary school teachers and 47 deputy head teachers of the 47 public primary schools in Mumias West sub-county of Kakamega county, Kenya. Respondents included 20 head teachers, 20 deputy head teachers and 240 teachers randomly sampled from selected schools. Data was obtained by use of questionnaire and document analysis guides. It was analyzed descriptively using frequencies and percentages. Hypothesis was tested using t-test.