This research aimed to explore the diversity of medicinal plants in Khok Hin Lad Community Forest and to study the ethnobotany of medicinal plants in Khok Hin Lad Community Forest, Waeng Nang Sub-district, Mueang Maha Sarakham District, Maha Sarakham Province using four 20m. x 50m. plots through sample size justification. The main focus was to allow the area to represent the local community at its best through suggestions of local medical practitioners and experts and explore types of plants and herbs with a trunk diameter at 1.30 m. greater than or equal to 10 cm. Species diversity index (H), Diversity (D), and Evenness (J) analyzed using Shannon Wiener Index showed that (H) was at 3.312066269; (D) was at 27.44176899; and (J) was at 0.73072114. Species diversity (H) was low which indicated that there were small number of medicinal plant species. Evenness (J) was moderate. Data compilation and interviews with local medical practitioners and scholars regarding the use of medicinal plants in Khok Hin Lad Community Forest in Maha Sarakham Province showed that all 93 species of medicinal plants various were used, including 60 species that were prepared through decoction; 18 species that were consumed fresh or used for cooking; 4 species that were crushed and squeezed for consumption, and 11 species that were used for bathing, showering, rubbing, or wound dressing.