A field experiment was conducted at Zarzoora Agricultural Re-search Station, EL-Beheira govemorate during 1999 and 2000 seasons to study the effect of five plant densities (70000. 105000, 140000. 175000 and 210000 plants/ fed ) on three soybean cultivars (3.35 , L. G.111 and Crawford ) under two sowing dates (May 151 and May 2595). The experimental design was spilt-spilt plot with three replications The main results of this work could be summarized as follows : 1. Early planting on May 151 significantly increased plant height, weight of pods and seeds/plant, weight of 100 seeds, seed, oil and protein yields/ fed, but decreased seed crude protein percentage in both sea-sons. Differences in pods and seeds/plant as well as oil percentage were significant in one season. However, number of branches/ plant was not significantly affected by sowing date in both seasons. 2. Plant height, weight of seeds/plant, weight of 1® seeds, seed oil content and seed, oil and protein yields/fed in both seasons, number of pods and seeds/ plant and weight of pods/ plant in the first season only were significantly influenced by soybean cultivars, whereas num-ber of branches/ plant and seed protein content were not significantly affected in both seasons. 3. Plant height and protein content were significantly increased by in-creasing plant population density up to 210000 plants! fed. While seed yield/ fed as well as oil and protein yields were significantly in‌creased with increasing density from 70000 up to 175000 plants/ fed in both seasons. All yield components an showed the opposite trend. 4. Planting date X soybean cultivar interaction significantly affected number of pods and seeds/ plant in the first season, weight of 100 seeds and seed oil % in both seasons. Interaction effects of planting date X plant density was significant on plant height, number of pods and seeds/ plant in one season, weight of 100 seed and seed oil % in both seasons. Plant height, number of branches/ plant and 100 seeds weight were significantly affected by the interaction between cultivar X plant density in the second season. None of the interactions had a significant effect on seed yielded in both seasons.