A detailed study was conducted to evaluate 76 diverse genotypes of tomato for yield and fruit quality under high temperature stress in open condition using randomized block design for two years 2020-2021 during summer season. The ANOVA showed the presence of significant variability among the genotypes for all the traits under study. Higher value for phenotypic and genotypic coefficient of variation was found in yield, number of fruits, average fruit weight. High heritability and genetic advance were observed for yield, number of fruits, average fruit weight, TSS, and pericarp thickness. Hence, during selection of genotypes for heat tolerance these traits must be given importance to get stable and genetically superior genotypes with higher degree of tolerance to heat stress. On the contrary, lower heritability and genetic advance along with lower phenotypic and genotypic coefficient of variation was observed for number of locules, dry matter content, lycopene content, fruit shape index, and titrable acidity.
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