This literature review explores the impact of autonomous delivery robots (ADRs) on last-mile deliveries, their value to the logistics and transport industry, and their potential to create competitive business models. ADRs are still developing technologies that could address the last-mile problem, especially in cities and for urban freight with increasing parcel deliveries. Last-mile delivery is changing due to e-commerce and demanding customers, but faces challenges such as infrastructure, emissions, and delivery time requirements. The review identifies four major themes: operations, infrastructure, regulations, and acceptance, which explain the barriers and benefits of using ADRs for last-mile deliveries. ADRs can impact last-mile deliveries by reducing costs, optimizing time, and lowering externalities. However, last-mile infrastructure would need to change for ADRs to be used more widely. Regulations for ADRs are not yet in place, and societal acceptance is another challenge due to the novelty of the technology. Despite these challenges, ADRs show great potential based on promising results from reviewed articles. However, most studies are theoretical, highlighting the need for real-world case studies and implementations. The review also discusses the operational processes of ADRs, including truck-based and hub-based systems, and their impact on costs, time, and externalities. The review highlights the potential of ADRs to reduce costs, improve delivery times, and lower emissions, but also notes challenges such as security risks, infrastructure requirements, and regulatory issues. The review concludes that while ADRs have the potential to improve last-mile delivery, their successful implementation requires addressing technical, regulatory, and societal challenges.This literature review explores the impact of autonomous delivery robots (ADRs) on last-mile deliveries, their value to the logistics and transport industry, and their potential to create competitive business models. ADRs are still developing technologies that could address the last-mile problem, especially in cities and for urban freight with increasing parcel deliveries. Last-mile delivery is changing due to e-commerce and demanding customers, but faces challenges such as infrastructure, emissions, and delivery time requirements. The review identifies four major themes: operations, infrastructure, regulations, and acceptance, which explain the barriers and benefits of using ADRs for last-mile deliveries. ADRs can impact last-mile deliveries by reducing costs, optimizing time, and lowering externalities. However, last-mile infrastructure would need to change for ADRs to be used more widely. Regulations for ADRs are not yet in place, and societal acceptance is another challenge due to the novelty of the technology. Despite these challenges, ADRs show great potential based on promising results from reviewed articles. However, most studies are theoretical, highlighting the need for real-world case studies and implementations. The review also discusses the operational processes of ADRs, including truck-based and hub-based systems, and their impact on costs, time, and externalities. The review highlights the potential of ADRs to reduce costs, improve delivery times, and lower emissions, but also notes challenges such as security risks, infrastructure requirements, and regulatory issues. The review concludes that while ADRs have the potential to improve last-mile delivery, their successful implementation requires addressing technical, regulatory, and societal challenges.