In this paper, we examine the influence of contract importance, feelings of violation, and workplace familism on the relationship between psychological contract breach and organizational deviance. Results from a study of 168 supervisor–employee dyads in a pharmaceutical organization suggest that (a) feelings of violation mediated the relationship between perceived breach and supervisor-rated organizational deviance; (b) relational and transactional contract importance influenced the relationship between breach and feelings of violation such that the relationship was stronger under conditions of high relational and transactional importance; and (c) high levels of workplace familism mitigated the effects of feelings of violation on supervisor-rated organizational deviance.