This thesis explores how organizational identity (OI) affects military agility (MA) in professional armed forces. Anchored in war studies, it integrates Albert and Whetten’s (1985), Whetten’s (2006) and Finkel’s (2020) frameworks. Through a qualitative comparative case study of two Swedish Army regiments, the study investigates how OI promotes or constrains the conditions for military agility. The analysis identifies four mechanisms through which OI enables or constrains adaptation: normative coherence, structural alignment, institutionalized learning, and narrative and linguistic integration. Findings show that OI is not a passive backdrop shaping conditions for MA but a dynamic institutional infrastructure, shaped by its collective anchoring and practical enactment. Theoretically, the study clarifies how OI-mechanisms underpin MA. Practically, it offers a framework for understanding how identity work can enhance adaptability in military organizations facing uncertain and changing environments.