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An adapted sustainable management program was used to evaluate lettuce tolerance to salt stress using autochthonous biostimulants (arbuscular mycorrhizal fungi (AMF), plant growth-promoting rhizobacteria (PGPR), and compost). Salinity harmed plant growth, root colonization, and physiology. However, biostimulants application, especially AMF and PGPR treatments, significantly improved lettuce growth and salinity tolerance (120% and 50%, respectively, for biomass; 60% and 20%, respectively, for stomatal conductance; and 1.5% and 1.3%, respectively, for chlorophyll fluorescence) compared to non-inoculated and compost-free controls under stressed conditions.