The Modified Triple Test Cross analysis was applied to estimate additive (D), dominance (H), and epistatic components of genetic variance for ten quantitative triads in tomato in spring-summer season. Three tests, BT-17 and PS-1 and three hybrids (BT-17x PS-1) were crossed to 15 pure breeding lines to develop the experimental materials. Overall epistasis and its component were significant for the traits days to flowering, number of flower per cluster and number of fruit per cluster. The epistasis x block reaction was non-significant for all the characters. The additive as well as dominance component of genetic variance were significant for all the characters except number of branches, fruit set percent and number of fruit per plant and only dominance component for number of fruit per cluster. All the traits showed partial dominance except number of branches, days to flowering, fruit size and fruit weight. Non-significant directional element (F) for days to flowering, number of flower per cluster, fruit set per cent, fruit weight and yield per plant suggest am bidirectional nature of dominance.