SCIENTIFIC ABSTRACT: Organizational identification (OID) is a component of organizational attachment reflecting the degree to which individuals consider their membership in a specific organization as self-defining. To date, research has treated OID as a static construct, assuming that it remains temporally stable over time once initially established. However, several theorists have raised the possibility that OID could be more dynamic than traditionally thought, at least when examined in the short term. Using an experience-sampling daily diary design, we examine the extent to which employees fluctuate in their daily level of OID and test potential predictors and outcomes of these within-person changes.