© West Indian Medical Journal 2022. This is an article published in open access under a Creative Commons Attribution International licence (CC BY). For more information, please visit https://creativecommons.org/licenses/by/4.0/deed.en_USObjective: Dyspepsia, one of the most commonly seen symptoms, can be due to organic dyspepsia (OD) or functional dyspepsia (FD). The aim of this study is to evaluate neutrophil-to-lymphocyte ratio (NLR) for the predictability of OD due to peptic ulcer disease (PUD) and gastric cancer (GC). Methods: We investigated retrospectively the patients with dyspepsia who underwent endoscopy. The study included 119 patients with OD (41 patients with biopsy-proven GC and 78 patients with PUD) and 100 patients with FD diagnosed. Results: The NLR among the patients with GC and PUD was significantly higher than FD subject (p < 0.001 each). The NLR in patients with GC was also significantly higher than that in patients with PUD (p < 0.005). When OD was compared with FD, NLR and white blood cell were statistically significantly higher (p < 0.001 and p < 0.05 respectively). The best predictive cut-off value of NLR was 1.72 with a specificity of 63% and a sensitivity of 66% for OD, on receiver-operating characteristic curve analysis. Conclusion: Neutrophil-to-lymphocyte ratio was higher in patients with OD compared with those with FD, and even higher in patients with GC. Our findings suggest that NLR should be calculated in patients with dyspepsia and patients with high levels of NLR should undergo endoscopy.