Line x tester analysis using a set of four females (lines), ten males (testers) and their forty hybrids was carried out to estimate the extent of heterobeltiosis and standard heterosis against standard check Gurjari for yield and ten other associated components in rice (Oryza sativa L.) in a Randomized Block Design during kharif 2011. Analysis of variance for all the characters revealed that parents and hybrids differed significantly for all the characters, indicating considerable amount of genetic variability in the material studied. Parents vs hybrids comparison was found significant for all the characters except panicle length and plant height. A total of 20 hybrids showed significant positive standard heterosis over the check Gurjari for grain yield per plant. The other characters showing high amount of heterobeltiosis and standard heterosis were days to 50% flowering, no. of effective panicles per plant, no. of grains per panicle and straw yield per plant. Test weight, protein content and amylose content were the characters for which only few hybrids showed significant positive heterosis. A comparison of per se performance with heterobeltiosis and standard heterosis suggested a direct positive correlation between them.