Aim: To evaluate the effects of three types of rootstocks: (i) Ngwangwa (ii) Sindano and (iii) Zinzi commonly used in the coastal belt of Tanzania on grafting success and seedling growth of six improved mango cultivars: (i) Apple (ii) Ngowe (iii) Kent (iv) Keitt (v) Alphonso and (vi) Tommy Atkins. Study Design: Plants were arranged in a split plot design with three replications. The rootstocks were main plots while the scion cultivars were subplots. Place and Duration of Study: At Chambezi research farm of Mikocheni Agricultural research institute (MARI) located at 6°30’S and 38°55’E at al titude of 12 meters above sea level in the coastal belt of Tanzania, from January 2014 to March 2015.