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Introduction: Preeclampsia is a disease which is associated with pregnancy and enhances perinatal and maternal morbidity and mortality. The relationship of obesity and preeclampsia is still under research among different populations. Aims & Objectives: The objective of this study is to determine the strength of association of body mass index with preeclampsia in pregnant women. Place and duration of study: Gynecology/Obstetric Departments of Services Hospital, Lahore General Hospital and Sir Ganga Ram Hospital Lahore from 1st January 2019 to 30th June 2019. Material & Methods: It was a matched case-control study. Sixty six diagnosed pre-eclamptic antenatal women were selected as cases and they were matched with equal number of normotensive antenatal women. The definition, source and eligibility criteria of cases and controls were pre-determined. Odds ratio was calculated to measure strength of association between preeclampsia and body mass index (BMI). Results: Among 66 preeclamptic women, the mean age was 26.76+5.82 years and among 66 normotensives mean age was 25.36+4.69 years. Among cases, 49.7% had BMI >25 and 30.3% had BMI <25. Likewise among controls, 40.9% had BMI >25 and 59.1% had BMI <25. Odds Ratio was 3.32. The result was found statistically significant (P=0.001). Conclusion: Study concluded that high body mass index is a risk factor of preeclampsia among pregnant women.