Abstract: The influence of arbuscular mycorrhizal fungus (Glomus etunicatum) and phosphorous fertilization was studied on growth and metabolic changes in broad bean plants (Vicia faba) grown under drought conditions. Addition of phosphate to the soil caused an increase in the growth of mycorrhizal and non-mycorrhizal plants. The applied drought stress reduced growth responses, net assimilation rate, mycorrhizal infection and nodulation of broad bean plants. Arbuscular mycorrhizal inoculation significantly increased dry matter production, photosynthetic pigments, phosphorous content, relative water content and alkaline phosphatase of broad bean compared to non-mycorrhizal plants, but these beneficial effects were significantly reduced with increasing soil phosphorous. In most instances, drought-stressed mycorrhizal plants had significant higher shoot dry weight, leaf area, nodule number, relative water content, acid and alkaline phosphatases and total soluble sugars relative to non-mycorrhizal plants particularly in P-deficient soil. Most of these parameters were unaffected by phosphorous fertilization, and therefore phosphorous had no effect on drought resistance of broad bean plants. So, G. etunicatum may be beneficial to the growth of broad bean plants exposed to soil water deficit.