Aims: To determine the prevalence of glucose-6-phosphate dehydrogenase deficiency and its variant (G6PD A-) among children diagnosed with Plasmodium falciparum malaria in Katsina state, Nigeria. Study Design: Cross-Sectional Studies. Place and Duration of Study: General Hospitals Katsina, Dutsin-ma, Daura, Baure, Malumfashi and Funtua of Katsina state, Nigeria from June, 2020 to December, 2020. Methodology: A total of 200 blood samples were collected from the study subjects after getting the ethical approval and informed consent. Their socio-demographic information and clinical presentations were also noted with the aid of questionnaire. G6PD deficiency was detected using G6PD qualitative test. Molecular characterization of African A- Variants was carried out using PCR and Sanger sequencing. Phylogenetic studies were carried out to analyze the relationship between the types of mutations found in Nigeria and other countries. Results: The G6PD qualitative test shows that 35(17.5%) samples were G6PD deficient which indicates significant association (PConclusion: This study has shown a high prevalence of G6PD deficiency among children diagnosed with Plasmodium falciparum malaria in Katsina State, North-western Nigeria. Polymerase Chain Reaction, NCBI blast, Phylogenetic and Bioinformatics analysis of the deficient samples shows that G202A mutation in relation to the deficient children was not statistically significant (p>0.05), hence does not appear to have a role in G6PD deficiency among children in the selected area of Katsina state, Nigeria though our findings were limited by the small sample size.