Food security refers to a condition in which all people, at all times, have physical, social, and economic access to sufficient, safe, and nutritious food that meets their dietary needs and food preferences for an active and healthy life. It is a multidimensional concept closely linked with sustainable development, poverty eradication, and the creation of resilient communities. In the context of sustainable development and smart cities, food security ensures that urban populations can access affordable, diverse, and quality food without compromising ecological balance or future generations’ needs. The rapid pace of urbanisation, climate change, resource constraints, and growing inequality make the achievement of food security a critical component of sustainable urban planning. Food security is commonly understood through four interrelated dimensions: availability, access, utilisation, and stability. Each of these components must function together to guarantee that people are adequately nourished. Availability refers to the physical presence of sufficient quantities of food within a region or community. It depends on agricultural production, food imports, buffer stocks, distribution networks, and innovations in supply chains. In the case of smart cities, availability extends beyond traditional farming to include urban agriculture, hydroponics, aquaponics, and rooftop gardens, which can supplement food supplies and reduce dependency on distant rural production. Efficient logistics, cold storage, and waste reduction strategies also enhance availability by minimising post-harvest losses. Access is the economic and physical ability of individuals to obtain appropriate food. Even if food is abundant, disparities in income, infrastructure, and mobility can limit people’s access to it. Urban poverty, informal settlements, and rising food prices often restrict access for vulnerable populations in cities. Policies aimed at improving access include social safety nets, targeted subsidies, food banks, and affordable retail outlets. Smart cities employ digital platforms to connect producers with consumers, optimise food distribution, and provide transparent pricing, thereby strengthening access. Well-planned transportation networks, inclusive marketplaces, and equitable zoning policies ensure that food outlets are within reach of all