Agriculture is one of the most culturally and economically important livelihood activities of the Ganges River Delta. In recent years, coastal communities have experienced longer dry seasons and salinity intrusion, which is exacerbated by registration errors in land tenure that have led to increasing encroachment by external interests in the Dacope sub-district of Bangladesh. These challenges threaten to undermine the sustainability of smallholder access to canals that are collectively managed as common-pool resources (CPR). This paper explores how identity and collective action may empower farmers to secure irrigation access in the face of external pressures. Drawing primarily on qualitative data collected through focus group discussions with farmers in Dacope, our findings reveal that identity serves as a powerful force driving collective action and the sustainability of the agricultural community. A shared occupational identity fosters a sense of belonging and collective responsibility among farmers to maintain water flow through construction, annual dredging, and temporary dry-season protections. However, despite a strong commitment to maintaining their irrigation system, challenges remain in farmers’ ability to combat the powerful interests of wealthier members of the community that threaten to undermine the viability of the irrigation commons. Thus, formal support through policy and legislative avenues is also necessary to safeguard common property rights against the threat of privatization and illegal occupation of canals. These findings further underscore the need for more research on how collective identity may strengthen collective action, livelihoods, and sustainability in the absence of strong institutional arrangements that uphold community rights and access to common-pool resources.