The treatment of diseases with synthetic drugs is often regarded as suboptimal and may cause side effects.Natural medicinal sources that are easy to obtain and affordable have therefore become a preferred optionfor many communities. Among plant groups, understory plants are among those most frequently examined fortheir medicinal potential. This study aimed to identify the diversity of understory plant species in the GunungPutri Block of Mount Ciremai National Park and to review their potential as medicinal plants. Understoryvegetation was surveyed using a plotted-line (belt-transect) method, with plots arranged along an elevationgradient at 100 m intervals, and the data were analysed using the Importance Value Index and the Shannon–Wiener species diversity index (H′). Medicinal potential was assessed through a literature review ofdocumented traditional uses and previously reported bioactive compounds, rather than throughphytochemical or pharmacological testing. The survey recorded 39 understory plant species, of which 16 wereidentified as having potential medicinal uses. Across all elevation intervals, the species diversity index fellwithin the range 1 ≤ H′ ≤ 3, indicating that the diversity of understory plant species in the study area ismoderate. Leaves were the plant part most commonly used for medicinal purposes, followed by roots, tubers,latex, and flowers. Ethnobotanical and laboratory validation is recommended as a follow-up study. Keywords: diversity; identification; lowland forest; medicinal plants; understory plants