ABSTRACT This was undertaken to find out the effects pf teacher effectiveness on pupils' performance at PLE in Omarari coordinating centre, Omoro sub county, Alebtong District. This case study was carried out in four selected primary schools out of the twenty primary schools in Omoro Sub-county, these schools were selected due to their being Zonal centers where coordination and meetings and trainings are done due to proximity, it is also intended that they are developed into centre of excellence for other schools within the zone to evaluate the good practices to improve on their school performance. Ten teachers and ten pupils from each school was targeted and four members of the school management committees. Tests, Questionnaires and interviews were conducted and all targeted respondents responded. The findings obtained from the respondents revealed that there is a positive correlation in relationship between teacher effectiveness and pupils' performance as analyzed by spearman's rank correlation coefficient. Therefore results obtained from the four schools showed that teachers, headteachers should work hard to improve performance in schools.