There are increasing pressures for bioethics to emphasise ‘translation’. Against this backdrop, we defend ‘speculative bioethics’. We explore speculation as an important tool and line of bioethical inquiry. Further, we examine the relationship between speculation and translational bioethics and posit that speculation can support translational work. First, speculative research might be conducted as ethical analysis of contemporary issues through a new lens, in which case it supports translational work. Second, speculation might be a first step prior to translational work on (...) a topic. Finally, speculative bioethics might constitute different content altogether, without translational objectives. For each conception of speculative bioethics, important methodological aspects determine whether it constitutes good bioethics research. We conclude that whether speculative bioethics is compatible with translational bioethics—and to what extent—depends on whether it is being employed as tool or content. Applying standards of impact uniformly across bioethics may inappropriately limit speculative bioethics. (shrink)