The present investigation was conducted during Khraif seasons 2021-22 (Y1) and 2022-23 (Y2) to estimate heritability in the narrow sense and genetic advance in percent of meanusing diallel mating design with ten diverse parents of brinjal. They were crossed in a diallel fashion (excluding reciprocals) for generating experimental material. All the Ten parents and their 45 hybrids were grown in randomized block design with three replications. Observations were recorded for the twenty characters and the high heritability (h2ns) coupled with high genetic advance as percent of mean were observed for fruit polar length, fruit equatorial circumference, length of calyx, average fruit weight, number of fruit per plant, fruit yield per plant, total phenol content in both the season (Y1, Y2) and over season pooled indicating thereby that these traits were less influenced by environment and were mainly under control of additive genes. This suggested that these characters could be improved through appropriate selection procedures.