In this paper I present a moral account of the legal notion of deceptive advertising. I argue that no harmful consequences to the consumer need follow from a deceptive advertisement as such, and I suggest instead that one should focus on the consequences of permitting the practise of deceptive advertising on society as a whole. After a brief account of deceptive advertising, I move to discuss the role of the reasonable person standard in its definition. One interpretation of this standard (...) is empirical, aiming to objectify the quality of misleadingness in the advertisement. I offer an alternative normative interpretation which aims to draw the line between the advertiser's responsibility and that of the consumer, between misleading and miscomprehension. I then examine and reject several possible moral grounds for condemning and prohibiting deceptive advertising. These include: harm, in the sense of welfare, to the misled consumer; harm to competitors; and a violation or a reduction of the consumer's autonomy. Finally, I explain how the effect of the practise of deceptive advertising on society as a whole should inform our normative line-drawing between misleading and miscomprehension, and how it provides the basis for the moral evaluation of deceptive advertising. (shrink)