In this paper, I summarize the medical evidence regarding the auditory and non-auditory effects of noise and analyse the ethics of noise and personal autonomy in the social environment using a variety of case studies. Key to this discussion is the fact that, contrary to the traditional definition of noise, sound can be noise without being annoying, as the evidence shows that some sounds can harm without being perceived. Ultimately, I develop a theory of ‘noisy autonomy’ with which to guide (...) us in discussing the public health ethics of noise and other sounds. (shrink)