Forested ecosystems play a central role in regulating freshwater resources through transpiration, stem water storage, and growth processes, yet these controls remain difficult to quantify under increasing climatic variability and drought stress. High-frequency, in situ monitoring is essential for resolving tree-level water dynamics that underpin forest–water interactions. Dendrometers are non-invasive, relatively low-cost instruments that continuously track stem radius variations, providing insight into growth, stem water storage dynamics, growth–water trade-offs, and tree-level drought responses. Large-scale dendrometer networks in Europe have demonstrated their value for identifying continental patterns of drought vulnerability, highlighting the potential of coordinated monitoring efforts. Despite growing use of dendrometers in forest ecohydrology and ecophysiology, data collection and processing remain fragmented in Canada and elsewhere, with few opportunities for cross-site synthesis. An emerging global dendrometer network is presented that aims to connect researchers and enable data sharing, methodological harmonization, and collaborative synthesis. Current priorities include the development of (1) best-practice protocols for dendrometer use and data processing, (2) a synthesis of ecohydrological insights from dendrometer data and identification of important knowledge gaps/identification of research priorities in the field, and (3) a methodological comparison of dendrometer techniques. These efforts are supported by a centralized dendrometer metadatabase designed to facilitate transparent, cross-site analyses. These coordinated efforts provide a foundation for cross-site synthesis and collaborative research. With forest ecosystems spanning strong hydroclimatic gradients, Canada is well positioned to contribute meaningfully to international dendrometer research advancing understanding of forest–water dynamics under climate change.