Ecosystems worldwide are facing increasing threats from climate change, and it is important to understand their impacts on key organisms. Ants are one of the most ubiquitous, widespread, and abundant groups of animals on earth, providing a variety of basic and vital ecological services. Although there is increasing knowledge about the effects of climate change on ants, this information is scattered and we are still far from a global understanding of its consequences for ant communities and their provision of ecosystem services. We have even less of a mechanistic understanding of how and why some species and communities are more vulnerable or resilient than others. This book synthesizes the latest findings about the effect of climate change on ants addressing different level of ecological organizations, from individuals to ecosystem services relating to interactions between ants and plants.