Synthesis of naturally occurring diamino sugars and their stereoisomers are reviewed. Preparation of stereoisomers of the following diamino sugars are described together with some synthetic problems : 2, 4-diamino-2, 3, 4, 6-tetradeoxyhexose via 3, 6-dideoxy-2, 4-di-O-mesylhexopyranosides, 2, 4-diamino-2, 4-dideoxypentose via 2, 3-anhydro-4-azido-4-deoxypentopyranosides, and 2, 3- diamino- 2, 3- dideoxypentose via 2, 3- epimino- 2, 3- dideoxypentopyranosides.