‘I know his name.’ ‘I know something about him.’ ‘I know him.’ Consider how these uses of ‘know’ differ. The first two instances of know, seem to point to knowledge about something. Yet in the latter claim, the subject of the assertion is not a singular fact, but another person. I call these knowledge claims interpersonal knowledge. In the following paper, I provide an account for these interpersonal knowledge claims which employs the Conversational Contextualist view of language by synthesizing Allan (...) Gibbard’s Norm-Expressivist account for ‘good’ with an account of knowledge based in social epistemology. Under my theory ‘knowing someone claims’ amount to endorsements of our beliefs; as such, there is no truth-apt interpersonal knowledge. What is occurring is a self-assessment of our relationship to another person, based on our non-cognitive attitude towards the fact that we should know them. Therefore interpersonal knowledge claims are self-affirmations that assert we are doing what we believe we should, in an attempt to embody our perceived relationship with another person. -/- . (shrink)