The proliferation of non-linear loads and the integration of distributed generation sources have led to a deterioration in Power Quality (PQ) within distribution networks. Voltage sags, harmonics, and flicker are prevalent issues that not only affect the performance of sensitive equipment but also result in economic losses for utilities and consumers alike. Traditional PQ improvement methods often fall short in addressing these multifaceted challenges, necessitating the exploration of more sophisticated solutions. The Unified Power Quality Conditioner (UPQC) emerges as a promising technology that can simultaneously address multiple PQ issues. This paper investigated the efficacy of UPQC in enhancing PQ within distribution networks, thereby providing a robust framework for its implementation. The study employed a structured approach to literature selection and analysis, adhering to established guidelines for systematic reviews in engineering. The search strategy involved querying multiple databases using keywords such as "UPQC" " PQ" "distribution networks," and "systematic review." Inclusion criteria were established to focus on empirical studies that specifically addressed the performance of UPQC in enhancing PQ. The analysis was conducted using qualitative synthesis to identify common themes and quantitative metrics to assess the impact of UPQC on various PQ parameters. From the findings, UPQC was found to effectively reduce voltage sags and swells, with studies reporting significance improvements in voltage stability. The study also revealed that UPQC has the ability of mitigating harmonics, or significantly reducing the Total Harmonic Distortion (THD) levels. Furthermore, the study indicated that implementation of UPQC is associated with a marked decrease in flicker severity, contributing to improved consumer satisfaction and equipment longevity. However, the variability in performance outcomes across different studies suggests that the effectiveness of UPQC is contingent upon specific operational contexts and configurations.