Salinity is one of the main environmental constrains to crop production. Salt stress induced physiological drought may depress water absorption from the soil, in one hand, and salt induced ionic toxicity may impair cellular functions and physiologyical process, such as photosynthesis and respiration, leading to meaningful decreases in plant growth and productivity. Considering the expansion of saline soils, identification of salt tolerant genotypes of different crop species including cucumber is necessary. This study was aimed at studying the effect of salinity on cucumber cultivars in a 4-neplicate factorial experiment. Four cucumber cultivars namely Amiran, Rashid, super unbeat and super N3 were studied under six levels of NACL salt ( including control, 25, 50, 75, 100 and 125 mM ) in an induar experiment. The effects of salt on cucumber were evaluated at germination and vegetative growth stages. Salinity led to signification decreases in all germination attributes including germination percent and velocity, plumul length and diameter and number of lateral roots. The smallest decrease in germination velocity was found to belong to cultivar Amiran. Intraction of cultivar and salt was found to be significant for plumal length and diameter and number of lateral roots, Amiran indicated the smallest decreases in the latter attributes under the 125 mM of NACL, compared to the rest of cutivares. Salinity led to significant decreases in plant height, stem diameter, number of lateral rootes, number of leaves, days to flowering, shoot fresh and dry weights, root fresh, chlorophyll index, quantum efficiency of psII and k + content of shoot and root at vegetative phase of growth. Salinity led to increases in proline content, electrolyte leakage, Na + content, Na + / k + ratio of shoot. Cultivar super N3 was found more tolerant to NACL at the vegetative phase, compared to the remainder of cultivars. Interaction of cultivar and salt at vegetative phase was found significant for plant height, stem diameter, number of lateral roots, number of leaves, number of flowers, root dry height, shoot fresh height, shoot Na + content, root k + and Na + content and quantum efficiency of psII and chlorophyll index. It could be concluded that salinity leaves negative impacts on growth attributes of cucumber in both cultivar-dependent and growth stage-dependent manners. Key words : Cucumber, salinity, germination, vegetative growth