Objective: To investigate sestrin 2 (SESN2) levels in preeclampsia (PE) cases and uncomplicated pregnancies. Methods: Cross-sectional study including 26 pregnant women with PE, 24 with severe-PE, and 30 randomly selected healthy pregnant women. Results: The mean arterial pressure, severe proteinuria, number of HELLP syndrome cases, and serum SESN2 levels in the severe PE group were significantly higher than those in the other groups (p < 0.001, p < 0.001, p = 0.006, and p = 0.004, respectively). Negative correlation was found between the birth interval (r = -.262, p = 0.019) and the SESN2 level. Conclusion: SESN2 seems to play a role in the pathophysiology of PE, especially in severe PE cases.