The last three decades have witnessed increasing interest in the connections between migration and development. Within this body of work less attention has been paid to the ways in which ideas of race and racialised histories and geographies shape the migration-development nexus. Focusing on diasporic communities as key actors within this nexus and using empirical material from Great Britain’s Department for International Development (DfID), this paper explores the shifting constructions of ‘the diaspora’ within the global development context from DfID’s inception in 1997 to its demise in 2020. Constructions of the diaspora-development nexus can be framed as a (shifting) assemblage, bringing together contemporary post-colonial politics of belonging, the racialised histories and geographies of development and the changing (neoliberal) architectures and cultures of development. The paper concludes that in this context, diasporic-centred development can be considered a racialised socio-political mechanism, shaped by the shifting politics of race and belonging, which are themselves bound to colonial pasts and contemporary colonialities. This attends to processes of inclusion (and exclusion) in the global development sphere in contemporary Britain and speaks to the need to think more widely about how race intersects with the migration-development nexus.