Background: Due to its high frequency and its multiple short-and long-term complications, obesity is considered a major public health problem. Its prevalence among women of childbearing age has doubled worldwide. Objective: The objective of our study was to evaluate the risk factors and maternal complications associated with obesity or pre-existing overweight in pregnancy. Materials and Methods: We carried out a comparative prospective study including 289 pregnant women; the different maternal clinical Sociodemographic characteristics were studied in 181 overweight or obese parturient and were compared with those of 107 normal-weight parturients. Results: The mean age of normal weight parturient was 30.09±6.55 and 32.31±6.13 for overweight or obese parturient and the majority of obese cases were multiparous. The analysis of several factors and maternal complications showed that some of them were associated with overweight or obesity, namely: maternal age ≥32 years (p=0.004), duration of taking the oral contraception of 19.35±23.92 (p=0.002), parity ≥1 (p<0.001). Moreover, 93.9% of obese had gestational diabetes history of (p=0.012), 78.8% suffered from allergies (p=0.041) and 63.4% from infertility problems (p=0.047). During pregnancy, 77.8% of overweight or obese parturients suffered from hypertension (HTA) (p=0.045) and 93.8% from gestational diabetes DG (p<0.0001). Conclusion: Our study shows that obese or overweight parturient was most affected by DG and arterial hypertension, for this reason, the care of overweight or obese women is necessary by establishing a follow-up program before and after conception in order to prevent or reduce maternal complications.