The Irish local government sector is a key player with respect to the State meeting its climate change commitment of net zero greenhouse gas emissions by no later than the end of 2050. Its broad operational remit in providing over 1,000 services, many of which require climate proofing, and its close relationship with communities, means that its contribution is critical if national and EU climate commitments are to be met. In light of various policy and legislative requirements in recent years, the sector has committed to monitoring, evaluating and reporting annually on its climate actions under the Local Authority Climate Action Charter and the sector’s climate action strategy, Delivering Effective Climate Action 2030. This research builds on an initial scoping exercise undertaken in 2021 to understand how the sector can best monitor and report on climate actions through the identification of key performance indicators (KPIs). The current research advances that work and addresses four research objectives to further support the sector in identifying and implementing climate action KPIs. First, it sets the context for the changing role of local authorities on climate action in recent years. Second, it identifies an updated set of KPIs that individual local authorities can select from to track specific local climate action outcomes and that can be aggregated for the local government sector. Third, it aligns each KPI to specific services and functions performed by local authorities. This is guided by the categorisation of services and functions in the Local Authority Climate Action Plan Guidelines (Draft). And fourth, it categorises KPIs under the six thematic areas identified in the local government sector’s own climate action strategy, Delivering Effective Climate Action 2030. Research objective 1: Results of the research illustrate that the local government sector has taken on significantly expanded responsibilities for climate action in recent years. Research objective 2: An extensive literature review integrating both academic publications and a selection of best practices across municipalities considered at the forefront of climate action globally was undertaken in June 2022. This resulted in 121 KPIs being identified as potentially relevant to the Irish local government sector. Research objective 3: KPIs were subsequently aligned to 19 pre-defined local authority functional areas. This mapping exercise is a useful starting point for the sector in identifying KPIs based on specific operational services it provides. Research objective 4: Each KPI was aligned to six strategic goals within the sector’s climate action strategy. 15 KPIs met two strategic goals, 64 aligned to three strategic goals, 27 KPIs met four strategic goals, 6 KPIs related to five strategic goals and 9 KPIs aligned to all six strategic goals. The 121 KPIs offer an opportunity for the sector to review and refine these for future use based on their own particular needs. At a strategic level, this should involve key sectoral stakeholders identifying and agreeing a set of indicators that support the sector’s climate action commitments as contained in the Climate Action Charter and Delivering Effective Climate Action 2030. This research provides a useful baseline in advancing this process. Overall, this report supports the local government sector to deliver on its national climate action commitments and in demonstrating public sector climate action leadership. Whilst these indicators represent relevant metrics applicable to the sector, it is important to recognise the evolving nature of climate policy at both EU and national levels. Periodic reviews of indicators to ensure they remain relevant, are aligned with international best practice, and are applicable to current policy and local authority operations are crucial.