Fluctuations in the abundance of populations – either of a single species across spatially disjunct locations, or of multiple species within a single location – are often correlated through time. Despite conceptual similarities, these two types of synchrony— population and community synchrony, respectively— have been studied as separate processes. The goal of our organized session is to integrate theory and methodology from population and community synchrony to better understand ecosystem stability across scales. For example, population ecology has highlighted that synchrony of a species’ abundance across space is an important indicator of species stability. Community ecology, in contrast, has highlighted that asynchrony between multiple species’ abundances may enhance the stability of communities and their functions (such as total productivity). Conceptually linking population and community synchrony therefore provides a bridge for understanding stability at an ecosystem scale. Moreover, cross-applying methodologies developed for population or community synchrony may yield new insights into each. For example, wavelet approaches developed to quantify population synchrony may help us to understand the timescales and drivers that cause communities to be synchronous or asynchronous. The maturation of many long-term datasets, coupled with new experiments targeting underlying drivers of synchrony, make it an opportune time to integrate our understandings of synchrony in populations and communities. This session brings together both field and theoretical ecologists with backgrounds in population or community synchrony. Some speakers in this session will describe how community and population synchrony manifest in their focal systems, and others will synthesize dynamics across ecosystems. A number of speakers will present new methodological tools for integrating population and community synchrony, drawing upon both mechanistic and statistical approaches. Finally, several speakers will present conceptual frameworks linking previously disparate theories of synchrony.