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Approximately two-thirds of the nation’s elementary and secondary schoolteachers are represented by the American Federation of Teachers or the National Education Association. Surprisingly, however, relatively little is known of the impact of teachers’ unions on student achievement. The authors offer evidence on this point by estimating “college entrance exam production functions” for a national sample of 2,360 students. Of particular importance, the estimation includes a correction for the selectivity bias inherent if the analysis considers only the performance of test-takers. Results indicate that students in a unionized environment score about 4.7 percent higher on their college entrance exams (SAT and ACT) than their counterparts from a nonunion environment.