The study investigated principals’ quality control techniques and teacher’s task performance in public senior secondary schools in Rivers State. The design adopted for the study was correlational design. Three research questions and three corresponding hypotheses guided the study. The population of the study comprised 9,011 principals and teachers in the 268 public senior secondary schools in Rivers State. A sample of 528 principals and teachers were randomly selected for the study using simple random sampling technique. The instruments used for data collection was titled ‘Principals Quality Control Techniques Questionnaire’ (PQCTQ) and ‘Teachers Task Performance Questionnaire’ (TTPQ). The face and content validities of the instruments were ensured. The reliability of the instruments was determined using Cronbach Alpha statistics yielding reliability co-efficient of 0.81 and 0.79 respectively. Responses to the research questions were analyzed with Pearson Product Moment Correlation, while the hypotheses were tested with independent sample t-test statistics. The findings of the study showed that principals’ quality control techniques of strategic planning, employee involvement and peer review significantly relate to teachers’ task performance in public senior secondary schools in Rivers State. Based on the findings of the study, it was recommended among others that principals should ensure that the plans they make for the teachers should include training and developing the teachers and not outright replacements.