The study investigated parental conjugal stability as predictor of academic achievement among secondary school students in Odeda Local Government Area of Ogun State. The study used descriptive survey technique and four null hypotheses guided the study. A self-designed questionnaire tagged "Parental Conjugal Stability and Academic Achievement Questionnaire (PCSAAQ)" with a reliability value of 0.73 was used to generate data for the study. A sample of 150 participants (75 male and 75 female junior secondary school students) from five schools was selected using stratified sampling method.