word count 5976 Introduction There are many overlapping concepts of trust within philosophy. These are multiplied still further when we look to other disciplinessuch as psychology, economics, and sociologyand when we reflect upon our ordinary ways of thinking and talking about trust. Sometimes trust is thought of as an emotionally-thrilling leap into the dark; sometimes it is pictured as a bloodless pragmatic choice, based on cost-benefit analysis. Paradigmatic settings for trust vary from our most intimate personal relationships to our interactions with government, media, or corporate brands. And we talk of trusting what someone says, trusting someone to do something, or simply trusting someone, all to varying degrees. Absence of trust, likewise, is multi-faceted. It inherits all the conceptual variety associated with trust. Moreover, for any given notion of trust, there are at least three different ways in which trust can be absent. First, we may lack trust in a given situation because we think that neither trust nor distrust is merited, that trustworthiness is not at stake. For example, my neighbour is not a philosopher, and has not offered to write this chapter for me. So I do not trust my neighbour to write this chapter for me, but nor do I distrust her in that respect: I recognise that neither of these attitudes fits the situation. Second, we may lack trust through lack of evidence: we think that a situation is one in which either trust or distrust is appropriate, but we can't tell which of these is the right attitude. For example, suppose my neighbour has offered to care for my garden whilst I'm away, but I don't know whether she is trustworthy in such matters. I think that either trust is appropriate here, or else distrust is appropriate, but I don't know which. Third, we may lack trust when we think that trust-or-distrust is appropriate, i.e. that trustworthiness is at stake, and moreover that trust is inappropriate. For example, suppose my neighbour has promised to turn off her music at midnight, but I know from bitter experience that she never keeps such promises. In such a situation my lack of trust amounts to distrust. Thus distrust should be distinguished from mere lack of trust, and from mere agnosticism about trust. The relationship between trust and distrust is in some ways analogous to that between justice and injustice: it is fruitful to examine justice through the lens of injustice, and likewise it is fruitful to examine trust through the lens of distrust (I pursue this project in Hawley (2014a)). On any understanding of trust and distrust, these attitudes are intertwined with issues of social power (Allen (2017)). Trusting, distrusting, being trusted, and being distrusted can all flow from the exercise of social power, and all can have consequences for social power. When you trust someone, you make yourself dependent upon her, giving her a certain power over you: a trusted person enjoys a great deal of discretion in her action. But, as Spiderman reminds us, with great power comes great respon...