This study was conducted to determine the reasons why teachers choose to work in Catholic schools. The Catholic School Teachers Professional Choices Questionnaire was sent to 65 teachers and administrators in 4 Chicago Catholic elementary schools and 1 Catholic high school. Fifty-four completed questionnaires were returned by 49 teachers and 5 principals (83 percent response). The questionnaire was divided into two main sections. The first section gathered demographic data; the second section was divided into categories relating to religious, professional, experiential, and practical reasons for choosing to teach in Catholic schools. By dividing the population into three groups--religious, Catholic lay, and non-Catholic--different emphases were placed upon the categories of questions. Consistent with previous research, respondents ascribed greatest importance to teaching as a profession, suggesting that the nature of a Catholic school provides an environment in which personal faith issues can be developed and one which is efficacious to classroom goals. The study not only determined reasons that teachers chose to work in Catholic schools but also why they did not so choose--the most significant being notoriously low salary and benefits. Responses to the questionnaire and a 25-item bibliography are included. (LL)