This paper presents the results of a study on organizational cultures in twenty units from ten different organizations in Denmark and the Netherlands. Data came from in-depth interviews of selected informants and a questionnaire survey of a stratified random sample of organizational members. Data on task, structure, and control characteristics of each unit were collected separately. Quantitative measures of the cultures of the twenty units, aggregated at the unit level, showed that a targe part of the differences among these twenty units could be explained by six factors, related to established concepts from organizational sociology, that measured the organizational cultures on six independent dimensions. The organizational culture differences found resided mainly at the levei of practices as perceived by members. Scores of the units on the six dimensions were partly explainable from organizational idiosyncrasies but were also significantly correlated with a variety of task, structural, and control-system characteristics of the units.