Groundnut the King of oilseeds is popularly called as wonder nut and poor men’s cashew nut. India exports groundnut kernels, shell, handpicked selected (HPS) groundnut and its oil cake forms. Groundnut plays a pivotal role in the oilseed economy of India. Endophytes are wide range of microorganisms that live in host plants without causing diseases. Endophytic bacteria, helps the plants directly by plant growth promotion strategies by providing phytohormones to the plant, controlling ethylene levels in the plant by ACC deaminase synthesis and distributing key nutrients like N, P, iron, and other elements from the environment. They can also promote plant growth and development by activating a variety of novel mechanisms, such as IAA production, phosphate solubilizing activity, and siderophore activity. Besides enhanced plant growth, they also protect plant health through different methods. Anticipating these advantages this research was designed and conducted to isolate and characterize endophytic bacteria from different crop plants, that could help in enhancing its productivity and thereby food security. The chosen endophytic bacterial isolates were evaluated for the PGPR activity such as nitrogen fixation, indole acetic acid (IAA) production, GA3 production, mineral phosphate solubilization, and siderophore (iron sequestering chemicals) production. The pot culture experiment was carried out in the Department of Agricultural Microbiology Annamalai University, Annamalai Nagar, Tamil Nadu. A Completely Randomized Design with three replicates and nine treatments were compared and each pot was considered one experimental unit. The effect of different treatments on plant growth parameters like plant height, root length, shoot length, germination percentage, vigour index, number of pods plant, Test weight seed yield and dry matter production (DMP) in Groundnut was assessed. The maximum germination percentage (96.21), vigour index (1624), plant height (56.42cm), root length (10.21cm), and shoot length (8.51cm) was recorded in treatment T2 (100 % RDF) it was on par the treatment T9 (Lysinibacillus sp. + Rhizobium + Bacillus megatherium + 50 % RDF) by recording the germination percentage (94.85), vigour index (1585), plant height (54.68cm), root length (9.84cm), and shoot length (8.23cm) was recorded. The maximum DMP production, number of pods plant, Test weight and kernel yield in Groundnut was recorded in T2 (100 % RDF) were 54.21 (g plant -1), 38.29, 51.99 (g plant -1) and 227 (g plant -1) and this was on par with T9 (Lysinibacillus sp. + Rhizobium + Bacillus megatherium + 50 % RDF) like DMP production, number of pods plant, Test weight and seed yield is 52.65 (g plant -1), 37.42 (g), 50.41 (g plant -1) and 225 (g plant -1).