 The question “Ought I to distrust?” has received comparatively little attention in philosophy despite it arguably being as important as the question of when to trust. People can get into serious trouble by distrusting when they ought not to, rather than just by trusting when they ought not to. The harms of misplaced distrust are both moral and epistemic and include dishonoring people, being out of harmony with them, and being deprived of knowledge via testimony (D’Cruz 2019; M. Fricker 2007). Presumably because they believe that the harms of misplaced trust are greater (D’Cruz 2019), philosophers—and consequently I, in this entry—focus more on the rationality of trusting, as opposed to distrusting.