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Background: Hypertension disorders are the most common medical complication during pregnancy. Preeclampsia is an important cause of mortality. The pathophisiology of it is still unknown. But sex hormon especially testosterone may be has a role in preeclampsia. We were conducted the comparison of serum free testosterone level in preeclamptic with normotensive pregnant women. Methods and Materials: This research was a case-control study included 27 women with singleton pregnancy who were complicated with preeclampsia (11 with severe preeclampsia and 16 with mild preeclampsia) and 62 normotensive pregnant women who were matched for age, body mass index (BMI) and gravity. Serum levels of free testosterone were measured by ELISA method. Results:Serum testosterone level was higher in preeclamptic group (1.66 ng/ml) than in mean of the control group (1.27 ng/ml), but this difference was not significant. Mean of testosterone levels in sever preeclampsia were higher than mild preeclampsia patients, however it was not statistically significant (2.08, 1.37, respectively). Conclusion: It seems that testosterone has not significant role in the pathogenesis of preeclampsia. .