We examine the impact of mandatory retirement on the retirement decisions of professors in Canada using administrative data. Estimation of a discrete time hazard model indicates that faculty members at universities with mandatory retirement at age 65 have exit rates at age 65 that are around 30 to 38 percentage points higher than those of their counterparts at universities without mandatory retirement. Similar results are found for both men and women; however, the magnitude of this effect is somewhat smaller for women. The estimated survival probabilities indicate that only 22.7 percent of faculty members employed at age 64 at universities without mandatory retirement will continue to be employed at the same university at age 72.