In a study on combining ability analysis in a half-diallel cross of cucumber resulted the mean square due to general combining ability (gca) and specific combining ability (sca) were highly significant for almost all the characters. Specific combining ability components of variance were higher than general combining ability components of variance in all the characters which indicated the importance of non-additive gene action. Predictability ratio and average degree of dominance confirmed the role of additive and non-additive gene action. The parents CRC-8, CHC-2, G-338, Pusa Uday, DC-1 and CH-20 were observed to be good combiner for number of characters including yield per plant. The crosses CRC-8 x Pusa Uday, CHC-2 x Pusa Uday and CHC-2 x DC-1 were most promising combination different characters including yield per plant.
