According to a prominent strand of thought in analytic philosophy of mind, certain judgments of the form “a is F” are such that, although one can be mistaken about what property it is that a has, one cannot be mistaken that it is a that has the relevant property. Judgments of this kind are said to be immune to error through misidentification (IEM). This article has two main aims. On the one hand, it responds to a need for a systematization (...) of the debate about immunity to error through misidentification, which consists of multiple contributions in epistemology, philosophy of language, philosophy of mind, and metaphysics that have accumulated throughout the last 80 years – since the publication of Ludwig Wittgenstein’s Blue Book – and which no one – to the best of our knowledge – has drawn together in an exhaustive and accessible way. On the other hand, the article will take a stand on matters concerning the nature, scope, explanation, and significance of immunity to error through misidentification. (shrink)