Objective:The objective of the study was to determine if the pre-gestational nutritional status is associated with obstetric complications in pregnant adolescents who attend a third level hospital in Northeastern, Mexico. Materials and methods: Information was collected from 148 pregnant adolescents aged 12-19. Pre-gestational nutritional status was assessed through nutritional screening and obstetric complications through the clinical file provided by the Outpatient Clinic No. 5 of the Gynecology and Obstetrics Service. Results: The average age of the population was 17.4 ± 1.34 years. A more significant number of adolescents with malnutrition were found (34.5% underweight and 31.8% overweight and obese). About 75% presented one or more obstetric complications, with maternal complications being the most prevalent (66.2%). When the complications were related to pre-gestational nutritional status, significant statistical differences were observed (p < 0.05). Conclusion: A correct assessment of nutritional status and pre-gestational nutritional orientation is essential to promote proper feeding in adolescents before and during pregnancy to meet their nutritional needs, thus reduce the risk of obstetric complications and/or complications during childbirth.