Perhaps the development of world civilization is going on along with the development of textiles. Textile fibers have been developed over many hundred years and most suitable fibers have been selected for the textile industries. Fibers have traditionally been used by humans in all cultures of the world to meet their basic requirements i.e. clothing, home, and especially technical purposes. The worldwide gradual development of textile industries meets the increasing demand of textile materials. Fiber is the first elementary raw materials of textile manufacturing. Originally it is either natural or manmade. The demand for natural fibers is constantly increasing due to their environmental friendly, hygienic, comfortable character, thermal insulation, breathability, and softness in feelings. The course of Natural Fibers will focus on natural base textile fibers. In this course we will go through the introduction, origin, chemical composition and structure, macro and micro-structure, different properties of different natural based fibers such as Cotton, Jute, Silk, Wool, Flax, Hemp, Ramie and Sisal fiber.