Invasive alien plant species (IAPS) are major drivers of biodiversity loss, ecosystem degradation and socio-economic impacts worldwide. Owing to its diverse physiography and climate, West Bengal encompasses ecosystems ranging from the Himalayas and Terai-Duars to the Gangetic plains, coastal regions, and the Sundarbans, making it highly vulnerable to plant invasions. However, an updated and comprehensive inventory of IAPS for the state has been lacking. This study presents a taxonomically validated inventory of 260 invasive alien plant species belonging to 192 genera and 61 families in West Bengal based on published literature, herbarium records, online biodiversity databases, and field observations. Among them 259 species of 191 genera, belonging to 60 families are angiosperms and 1 species (Salvinia molesta D.S. Mitch.) of 1 genus belonging to 1 family is pteridophyte. Dicotyledonous and monocotyledonous comprise 236 species, 173 genera, 53 families and 23 species and 18 genera and 7 families respectively. Dicotyledonous and monocotyledonous species are represented by 91% and 9% respectively. As far as habit is concerned, it was found that herbs, shrubs, trees, climbers, liana and bamboo occupy 60%, 15%, 18%, 4%, 1% and 2% of the total invasive plant species respectively. The recorded species occur across forests, wetlands, agricultural lands, grasslands, riverbanks, roadsides, urban areas, and other disturbed habitats, threatening native biodiversity, ecosystem functioning, and agricultural productivity. This updated inventory provides a valuable baseline for biodiversity assessment, ecological monitoring, invasion risk analysis, and the development of evidence-based management strategies. It also emphasizes the need for continuous surveillance, early detection, and coordinated management to reduce the ecological impacts of invasive alien plants in West Bengal.