This longitudinal study examines how person-organization fit, operationalized as congruence between perceived and preferred organizational culture, relates to employees' affective commitment and intention to stay with an organization during the early stages of a strategic organizational change. Employees in a large energy company completed surveys before (N = 687) and after (N = 627) the change. We measured perceptions and preferences with regard to four components of organizational culture (human relations, open systems, internal process, and rational goal) derived from the Competing Values Model (Quinn, 1988), as well as affective commitment to the organization and intention to stay. Using polynomial regression and response surface analyses, we found that both perceived culture and culture fit related positively with the criterion variables within and across time. The strongest evidence for relations involving fit was obtained for those components of culture specifically targeted for change. Implications for future research and the management of organizational change are discussed. (Contains 2 figures and 7 tables.)