Local Digital Twins (LDTs) have emerged as a crucial concept in the realm of urban management and governance, driven by the need for evidence-informed decision-making and enhanced operational efficiency. Stemming from the European Commission’s initial mention in 2021, the concept has evolved to encompass a broad range of capabilities, including real-time data integration, predictive simulation modelling, and interoperability with legacy systems. However, the literature lacks a standardised definition of an LDT, leading to confusion as to what exactly it is. This chapter attempts to capture and explain the concept of LDTs, focusing on their distinct characteristics, essential capabilities, and implications for urban governance and management.