New evidence is emerging to suggest that climate change mobility is giving effect to changing forms of island identity among Tuvaluans and i-Kiribati. This nascent shift prompts a number of questions addressed in this paper. What, for example, does climate change migration mean for island identity and its geographic performance? How does the spatialization of identity inform shared experiences of climate change, and how does identity assist in the formation of shared positions from which to advocate for change? Drawing on discourses of sedentarism and mobilization among Tuvaluan and i-Kiribati, we explore performances of identity related to climate change being fashioned and refashioned in different contexts.