Abstract: Introducing UPE worldwide led to a surge in enrolment rates in most countries, which often overwhelmed and exceeded the capacity of education systems. Severe constraints such as shortage of teachers and school materials led to overcrowding in Uganda, the student teacher ratio moved from 37.6million in 1996 to 59.4million in 1997.dropout rates also increased and survival rates sunk from 59% to 37%. Notable is that promoting a nation’s social and economic growth depends on universal primary education. This article investigated the universal basic education policy and the primary school completion rates of pupils in Isingiro District in South Western Uganda. A secondary data review and a qualitative research approach were the study’s compass. Document analysis was done, data from articles reports and research done by different scholars was collected to identify and examine relevant themes associated with the effect of UPE on completion rates in primary schools of Isingiro district. The main conclusion was that the introduction of UPE in primary schools of Isingiro district did not have observable positive change on the completion rates at the end of primary seven as compared to when UPE was not yet introduced to Ugandan education system.