As im/politeness scholars increasingly explore the intersections of identity and im/politeness, they reveal a growing need for empirical research that examines these intersections in a variety of discourses. This paper investigates the linkages between participants’ co-constructions of identity and impoliteness in naturally occurring classroom discourse. The data come from a corpus of conflictive interactions observed in seven hours of whole-class discussions and twelve hours of small-group discussions in four eighth-grade classrooms. This paper applies an analytic framework that combines a genre-approach (Garcés-Conejos Blitvich 2010, 2013) to impoliteness with a socio-constructivist approach (Bucholtz and Hall 2005) to identity, and it categorizes identity according to Zimmerman’s (1998) three broad identity types: discourse identity, (genre)situated identity, and transportable identity. In co-constitutive processes (Miller 2013), participants co-construct impoliteness and identity, strategically initiating and assessing potential impoliteness acts to assert and reject identity claims.