The present investigation entitled “Heterosis Analysis in F1 Hybrids of Bread wheat (Triticum aestivum L. em. Thell.) Over Environments” was undertaken using ten genetically diverse parents following diallel mating design excluding reciprocals. The resultant 45 F1s and all the ten parents were evaluated in randomized block design with three replications under three different environments created by three dates of sowing [15 November (E1), 1 December (E2), 15 December (E3)]. Sufficient degree of heterosis and heterobeltiosis was observed for all the attributes. | Heterosis analysis in F1 hybrids of bread wheat Triticum aestivum L. em. Thell. over environments