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This investigation was carried out under the screenhouse at New Valley research station during 2009/2010 to 2011/2012 seasons, to determine heterosis and general (GCA) and specific combining ability (SCA) for yield and yield attributes in fiveparental diallel crosses. Five faba bean genotypes (Vicia faba L.) were used as parental lines. Highly significant differences among the tested entries were detected for different traits, indicating wide genetic variability for all traits. Several crosses recorded significant positive heterosis percentages relative to mid parent (MP) and better parent (BP) for number of pods/plant, 100-seed weight and seed yield/plant ranged from 6.3 to 42.4%, 2.8 to 23.0%, 3.1 to 12.8%, 3.2 to 6.6%, and 4.2 to 30.4%, 13.2 to 22.6% relative to MP and BP for each character, respectively. The ratios of (GCA/SCA) exceeded the unity for all studied traits indicating that the genetic variation among these traits in the F 1 and F 2 appeared to be additive. The parental genotype, P 4 (1706B/87/2003) was found to be a good combiner for 100-seed weight and seed yield/plant and P 5

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