Rhizobium leguminosarum biovar viciae isolated from salt-affected faba bean fields were in vitro tested.  Different isolates were found to be varied in their tolerance to salinity. F₁ and E₁ were found to be the most salt-tolerant isolates even at EC-level of 12 ds m^-1. Seeds of Nubaria 1 cv. were inoculated with either F₁ or E₁, in comparison with a less salt-tolerant one (F₉) in pots their salinity were adjusted at 0, 3, 6, 9 and 12 ds m^-1 under aseptic conditions. Number and dry weight of nodules were decreased strongly by increasing salinity levels in comparison with control. Significant enhancement of N % accumulated in the shoots was also noticed due to the biological inoculation with both Rhizobium isolates in presence or absence of salinity. Under non-aseptic conditions, efficacy of F₁ and E₁ with the effect of mineral N-supply (25 and 100 %) was compared. In addition to Nubaria 1 cv., Sakha 1 cv. was also used in the evaluation process for N-fixation at 0, 6, 9 ds m^-1 levels. Number of nodules formed on Nubaria 1 at 9 ds m^-1 was highly increased from 7.86 and 5.44 for 25 and 100 % N-supply to 82.33 and 93.33 for F₁ and E₁, respectively. Accordingly, nodular dry weights were also increased to 0.40 and 0.41 g plant^-1 for F₁ and E₁ instead of 0.13 and 0.08 g plant^-1 for 25 and 100 % N, respectively. The beneficial effects of F₁ and E₁ inoculation were also extended to enhance N % of shoots and seed yield parameters. Therefore, the symbiotic N₂-fixation process has a great potential to improve growth and productivity of faba bean plants in comparison with the mineral N-supply to overcome the harmful effects of salinity.