Most of the rangelands in the Kingdom of Saudi Arabia are located in marginal ecosystems with low rainfall and high aridity index. Under these conditions, highly drought and salinity resistance perennial rangeland plant species play an important role in the sustainable livestock production which is highly depending on the nutritive value of the available forage. This study was conducted to evaluate the nutritive value of the common rangeland plants and to assess their potential utilization as livestock feed in the eastern region of Saudi Arabia. Twenty-two Rangel and plants (grasses, forb sand shrubs) were surveyed and collected from the study area. Proximate analysis of the common rangelands plants naturally growing on the study area indicated that rangeland plants contained 15.1 – 49.6 % of their fresh weight as dry matter. (DM) Ash, crude protein, crude fiber, organic matter, ether extract contents on dry matter basis in these plants ranged from 7.9 to 43.8, 5.4 to 15.4, 5.1 to 38.5, 3.4 to 7.9 %, and 56.2 to 94.5%, respectively. The neutral detergent fibers (NDF), acid detergent fiber (ADF) and Lignin contents (DM %) of the examined plants in this study were ranged from 16.3 to 70.4, 10.2 to 44.3, and 2.7 to 10.9%, respectively. Those plants also contained 0.058 to 1.341, 0.153 to 1.384, 0.92 to 10.283 and 0 to 4.2% tannis, nitrates, saponins and oxalates, respectively. Digestion coefficients for DM, ash, OM, crude protein (CP) and ADF% ranged from 22.7 to 75.7, 2.9 to 82.9, 18.4 to 88.1, 26.7 to 76.4, and 11.9 to 51.4 % in that order. In general, the obtained results indicated that most of the evaluated rangeland plants have good nutritive value and represent major livestock forage resources, and they might be cultivated using brackish and saline waters. Also, they are valuable plant resources for cultivation using seawater or a mixture of seawater and fresh water.