This study attempted to devise and validate a scale for measuring entrepreneurship among managers of the Tehran area's governmental organizations. A random selection of 410 managers, working in different ministries of Iran, participated in this research. In the first stage, a 121-item questionnaire of Hooman (2001) using Likert scale from one to four was used. The results of this stage of the study showed that the Cronbach's alpha coefficient of this questionnaire was 0.986 and the item-total Polyserial correlations of seven items were not significant. In the second stage, these 7 items in addition to an item that lacked significant factor loading were omitted from the original questionnaire. The new 113 item scale showed a reliability coefficient of 0.988. Principal component analysis, using a varimax rotation, resulted in the following components: endeavor risk taking, locus of control, fluency, creativity and innovation, flexibility, and uncertainty and ambiguity tolerance.