The research was conducted to evaluate the effect of biochar on growth, physiological traits and yield of groundnut cv. L27 under saline conditions. The two-factor experiment was arranged in a split-plot design. Factor 1 consisted of 4 rates of biochar (0, 5, 10, and 15 tons ha-1 ); factor 2 consisted of salinity and non-salinity conditions. The saline stress was imposed every three days for 30 days with 200 ml of 100mM NaCl solution at the flowering stage. The results showed that salinity significantly reduced growth and physiological parameters. Besides, salinity significantly increased the relative ion leakage and the water saturation deficit in the leaves resulting in reduced yield components and individual yield. The application of biochar improved growth and physiological parameters, yield components, and individual productivity in both salinity and non-salinity conditions. Comparison among biochar rates showed that the highest values of growth, physiological parameters, yield components, and individual productivity were observed in 10 tons biochar ha