Ougeinia oojeinensis (Roxb.) Hochr., belonging to the family Fabaceae, is a medicinally important deciduous tree widely distributed in the Indian subcontinent. Traditionally, different parts of the plant—especially bark and leaves—have been used for the treatment of diabetes, inflammation, wounds, infections, and hepatic disorders. In recent years, scientific interest has increased in exploring the phytochemical profile and pharmacological properties of O. oojeinensis leaves due to their rich content of bioactive secondary metabolites. The leaves are reported to contain diverse classes of phytochemicals such as flavonoids, isoflavonoids, phenolic compounds, tannins, terpenoids, steroids, glycosides, saponins, and carbohydrates. These phytochemicals are responsible for a wide range of biological activities including antioxidant, antidiabetic, anti-inflammatory, antimicrobial, hepatoprotective, wound healing, and cytoprotective effects. This review compiles and critically analyzes findings from approximately 30 published research papers, focusing specifically on leaf phytochemistry, extraction methods, analytical profiling, and biological activities. The review also highlights possible mechanisms of action and identifies research gaps for future exploration of O. oojeinensis leaves as a potential source of therapeutic agents.

2.Keywords: Ougeinia oojeinensis Leaves , Flavonoids,Alkaloids ,Terpenoids ,Saponins ,Tannins ,Anti-Diabetic ,Anti-Inflammatory ,Anti-Microbial ,Anti-oxidant .