This paper analyzes the emergence of ‘genomic sovereignty’ policies as a newly popular way for postcolonial countries to frame their investment in genomics. It identifies three strands in the genealogy of this policy arena—the International Haplotype Mapping Project as a model and foil for postcolonial genomics; an emerging public health genomics field which stands in contrast to Western pursuits of personalized medicine; and North American drug companies increased focus on ethnic drug markets. I conceptualize postcolonial genomics as a nationalist project with contradictory tendencies—unifying and differentiating a diverse body politic, cultivating national scientific and commercial autonomy and dependence upon global knowledge networks and foreign capital. It argues that the ‘strategic calibration’ of socio-political versus biological taxonomies in postcolonial genomics creates two primary challenges for this arena, which I refer to heuristically as dilemmas of mapping and marketing. Policy and Society (28:341–355 2009)