Synthetic biology (synbio) involves designing and creating new living systems to serve human ends, using techniques including molecular biology, genomics, and engineering. Existing bioethical analyses of synbio focus largely on balancing benefits against harms, the dual-use dilemma, and metaphysical questions about creating and commercializing synthetic organisms. We argue that these approaches fail to consider key feminist concerns. We ground our normative claims in two case studies, focusing on the public good, who holds and wields power, and synbio research projects’ particularity (...) and context. Attention to feminist concerns is essential for synbio to realize its potential in ethically justifiable ways. (shrink)