Diabetes mellitus (DM) and maternal obesity are in parallel related with adverse maternal and neonatal outcomes. Examination of the combined association of these common metabolic problems with pregnancy outcomes is an important question. Objective of our study was to determine associations of diabetes mellitus and obesity with adverse delivery outcomes. The primary outcome measures were duration of labor, mode of delivery, Apgar scores in 1st and 5th minute, obstetric interventions and maternal injuries at births. Women with DM were more likely to have Cesarean Section (p < 0.01) and less likely to have had an episiotomy and perineal repair than women without DM (all p < 0.05). Connections between DM and obesity with other adverse outcomes of labor have not been found.