This chapter provides detail description of Vitamin A. Chapter has 39 well-illustrated diagrams and pictures. Biochemistry and metabolism of vitamin A, sources, requirement, functions of vitamin A, vitamin A and immunity, interaction with other nutrients, epidemiology, vitamin A deficiency, hypervitaminosis A, teratogenicity, elimination of vitamin A deficiency and topical vitamin A are given in detail. 9 tables are included to highlight sources of vitamin A, vitamin A complications, classification of xerophthalmia, treatment of vitamin A deficiency and vitamin A prophylaxis schedule. 17 references are given at the end of the chapter for further reading.