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AIMS This study examines peer networking as a capacity-building strategy for the implementation of Housing First (HF), a complex community intervention targeting chronic homelessness. METHODS A qualitative, multiple case study was conducted to examine the capacity-building activities of two, multicommunity peer networks established by community leaders in the Canadian Homelessness sector. Data collection activities included document analysis, key informant interviews (n = 10), and a follow-up focus group with interview participants in each network. Thematic analyses were conducted for each network, followed by a cross-case analysis. RESULTS Engaging in a multicommunity peer network enhances leaders' capacity to advance HF by creating opportunities to foster trust and communication, inform continuous improvement, and navigate ambiguity. A number of contextual factors influence connections between peer networking and capacity building. CONCLUSION Peer networks are a valuable source of support and timely, contextually relevant knowledge for community leaders advancing local adaptation and implementation of HF.