Cluster analysis, the generally used technique in delineation of hydrologic homogeneous regions for regional flood frequency analysis, requires standardization of flood governing attributes, and hence makes use of large subjective consideration. A new technique is developed for the delineation with no need of standardizing the attributes. The technique uses Natural Resources Conservation Services runoff curve number as a starting point in proposing the hydrologic regions. Five numbers of hydrologic regions were proposed inside the Nepalese territory by superimposing monsoon rainfall map over the runoff curve number map. The L-moment based regional hydrologic homogeneity test led finalization of hydrologic regions with minor adjustments. Heterogeneity measure value, which is a regional homogeneity test parameter representing dispersion in sample moment coefficients among the basins, was found within or near acceptable limit in each of the region. The use of the regionalization for estimating extreme flood of different return periods is demonstrated for six example sites.