C.S. Ejiogu, J.U. Agbim, N.C. Onwubiko, A.A. Ngwuta, K.J. Nnadi, I.F. Umar, C.B. Kanu Variation, genotype, heritability, selection, improvement 162-172 9 (4) 2025 October, 2025 This study was conducted as an introductory genotype trial to evaluate the potential for introducing mung bean (Vigna radiata L. Wilczek) into the cropping systems of southeastern Nigeria, where it is not traditionally cultivated. Thirty genotypes were collected from IITA and evaluated at the Center for Agricultural Research and Extension of the Federal University of Technology, Owerri. As an introductory trial, the performance of the genotypes was benchmarked against global yield standards for the crop. Analysis of variance revealed significant differences among genotypes for all morphological and yield traits, indicating a substantial genetic base for selection. Narrow differences between phenotypic and genotypic coefficients of variation for most traits revealed minimal environmental influence on their expression. There was a significant positive correlation among the morphological and yield traits assessed. Furthermore, high heritability estimates as well as high expected genetic advance were observed for key yield components such as pod weight and number of pods per plant, indicating that these traits are governed by additive gene action and will respond effectively to selection. Cluster analysis grouped the 30 genotypes into five distinct clusters. The most divergent accession was identified as Tvr-2, which formed a solitary cluster, highlighting its unique genetic background. The clear separation of Tvr-2 into a unique cluster, based on its distinct phenotypic profile, presents an optimal opportunity for hybridization with the elite performers from Cluster III. We therefore recommend the use of the highly divergent Tvr-2 for crossing with the high-yielding genotypes (Tvr-3 and Tvr-109) to create broad genetic variability and combine favorable traits for the development of superior mung bean cultivars in future breeding programs.