Urban ecosystems are increasingly becoming hotspots for the introduction and proliferation of invasive alien plant species (IAPS), posing significant threats to the biodiversity, ecosystem services, and human well-being. This chapter delves into the multifaceted processes that drive the introduction, establishment, and spread of IAPS within urban ecosystems. By exploring the unique characteristics of urban environments—such as high levels of disturbance, diverse land uses, and the presence of multiple vectors for species movement—the chapter offers a comprehensive understanding of how these factors contribute to the vulnerability of cities to biological invasions. We examine key pathways of introduction, including horticultural trade, landscaping practices, and accidental transport, and analyze the ecological, economic, and social impacts of IAPS in urban areas. Furthermore, the chapter discusses management strategies and policy frameworks aimed at mitigating the risks associated with IAPS in cities. This chapter provides critical insights for urban planners, ecologists, and policymakers to effectively address the challenges posed by invasive species in the urban landscapes.