Objective: To study the microscopic evaluation and physicochemical analysis of Origanum majorana Linn leaves. Methods: Fresh and dried powdered leaf samples was studies for its morphology, microscopy, organoleptic characters, fluorescence analysis and various other WHO recommended methods for standardisation. Results: Leaves are simple, petiolated, ovate to oblong-ovate, (0.5-1.5 cm) long, (0.2-0.8 cm) wide, with obtuse apex, entire margin, reticulate veination and symmetrical but tapering base. The microscopy revealed the dorsiventral nature of the leaf. Both the surfaces show presence of numerous covering trichomes, diacytic stomata and thin walled, wavy epidermal cells. The covering trichomes are multicellular, uniseriate, thin walled and pointed. In the midrib region, the epidermis is followed by collenchyma and vascular bundle (xylem and phloem). Whereas; the mesophyll exhibited only palisade cells and spongy parenchyma. Conclusions: It can be concluded that the pharmacognostic profile can serve as tool for developing standards for identification, quality and purity of Origanum majorana Linn leaves.