To address the current and future information demands related to climate action, data producers need to understand the policy context, key stakeholders and their information needs, and be able to communicate effectively how their data can be used for policy applications. This report aims to provide the staff of national statistical offices (NSOs) with such knowledge, showcase what statistical systems already offer to support climate action, and provide ideas, inspiration and recommendations on how NSOs can make their offering more valuable for data users. The document examines a number of areas, such as the reporting under the Paris Agreement, climate change mitigation and adaptation, just transition, informing the public and financial aspects of climate action. The report identifies concrete ways in which national statistical offices (NSOs) can be involved and showcases what the statistical systems already offer to support climate action. The document's primary audience is NSO staff, including domain experts and managers. The Guidance aims to inspire and support those who want to start to work in this area or want to do more. The report may also benefit data users, other producers of climate change-related data in countries and international organizations involved in climate change-related statistics.