Introduction GDM is defined by WHO as glucose intolerance of variable severity with onset or first recognition during pregnancy. GDM usually occur due to impaired carbohydrate metabolism. GDM is increasing worldwide and progress to type 2 diabetes mellitus. An increase of GDM is also observed in Tanzania. Multiple associated factors of GDM like age, previous GDM, history of DM in the family etc, have been observed and may differ according to the population studied. GDM predispose the mother and fetus to increased risk of multiple complications during pregnancy and later. Its early identification and control reduces the complications and improve maternal and neonatal health. Broad objectives: To determine the Maternal and fetal outcomes among women with gestational diabetes in Moshi urban municipality (KCMC,Majengo and Pasua)from august 2016 to april 2017. Methodology The study design will be a prospective cohort study. The study area will be KCMC, Majengo and Pasua hospital. All pregnant women who will meet the criteria set will be enrolled and undergo OGTT. The maternal outcomes will be assessed and evaluated. All the newborn babies will be assessed by a pediatrician immediately after delivery.The data will be analysed by using SPSS version 22. The ethical clearance will be obtained from the KCMUCO ethical Committee.