BACKGROUND: Quality improvement strategies have been widely applied in health care; however, little is known about their use in primary care dietetics. This review aims to describe and evaluate the effectiveness of quality improvement strategies that seek to improve patient outcomes by enhancing dietetic care as compared to standard dietetic care. METHODS: This study employed a systematic review and meta-analysis design following PRISMA guidelines and included studies up to March 2021. Studies were included if they used a randomised controlled trial (RCT) design to evaluate the effect of a quality improvement strategy applied to care delivered by a dietitian on patient outcomes. A meta-analysis was conducted where there were sufficient studies with homogeneous populations and outcome measures. RESULTS: Twelve RCTs (n=1604) met the inclusion criteria for review and five studies (n=511) were eligible for meta-analysis for glycated haemoglobin in patients with type-2 diabetes. The most frequently reported quality improvement strategies addressed disease management programs (58%), patient education (67%), group care (42%), and patient self-management (42%). A positive intervention effect was reported in 50% of the included studies. A low grade of evidence supported a positive intervention effect for quality improvement intervention by a dietitian for glycated haemoglobin (pooled mean difference = -0.39% with 95% CI [-0.70;-0.08], p=0.01) in n=511 patients with type-2 diabetes mellitus. CONCLUSIONS: Interventions aimed at enhancing quality in primary care dietetic practice support improvements in patient outcomes. Further research on quality improvement interventions for patient outcomes are required to strengthen the evidence base in this important topic. This article is protected by copyright. All rights reserved.