International Bladder Cancer Group (IBCG) and Global Society of Rare GU Tumors (GSRGT) are launching a joint committee on rare variants of bladder cancer. This committee will bring together stakeholders from both organizations to collaborate on research, education, and clinical trial endpoints with a focus on rare bladder cancer variants. Bladder cancer is a significant global health issue, and the incidence of rare variants is increasing. This joint committee will be a dedicated subgroup that will focus on research and education, as well as clinical trial endpoints to make a meaningful impact on the future of bladder cancer treatment.