The 2024 Roadmap on 2D Topological Insulators outlines the current state and future directions of research in this field. 2D topological insulators (TIs) are materials with unique electronic properties, characterized by insulating bulk and conducting edge states. These edge states are protected by time-reversal symmetry and are crucial for potential applications in electronics, spintronics, and quantum computing. The roadmap highlights recent advances in the understanding of 2D TIs, including their theoretical foundations, experimental characterization, and potential applications. It also identifies key challenges that need to be addressed for the successful development of 2D TI-based devices. The roadmap emphasizes the importance of continued research in this area, and outlines a path forward for future studies. The roadmap is a comprehensive overview of the current state of research on 2D TIs, and serves as a guide for future research directions.The 2024 Roadmap on 2D Topological Insulators outlines the current state and future directions of research in this field. 2D topological insulators (TIs) are materials with unique electronic properties, characterized by insulating bulk and conducting edge states. These edge states are protected by time-reversal symmetry and are crucial for potential applications in electronics, spintronics, and quantum computing. The roadmap highlights recent advances in the understanding of 2D TIs, including their theoretical foundations, experimental characterization, and potential applications. It also identifies key challenges that need to be addressed for the successful development of 2D TI-based devices. The roadmap emphasizes the importance of continued research in this area, and outlines a path forward for future studies. The roadmap is a comprehensive overview of the current state of research on 2D TIs, and serves as a guide for future research directions.