This note has two main objectives. First, it highlights the critical need for low-carbon slum upgrading within city investments for climate mitigation. Second, it demonstrates that practical, affordable and adaptable low-carbon solutions for slum upgrading at the household level and neighborhood level are possible and have been implemented successfully in many slums in different countries. The note aims to inform urban practitioners and policy makers who are either directly involved in slum upgrading projects, or in a position to influence related policies. The following sections will discuss the entry points for low carbon development for the various approaches to slum upgrading, illustrate emerging low carbon solutions in buildings, water and sanitation, solid waste, energy, transportation and urban form, and highlight key considerations and lessons in the planning and implementation of low carbon interventions in slum upgrading.