Spirulina is a multicellular, filamentous cyanobacterium, formerly classified as a blue-green algae. It has gained considerable popularity in the dietary supplement and functional food industries, as well as in many other fields. Spirulina grows in water and can be harvested and processed into powder or any other galenic form to facilitate its use. It has very high macronutrient and micronutrient contents, notably proteins, unsaturated fatty acids, minerals and vitamins, as well as functional compounds responsible for antioxidant, anti-inflammatory and immunostimulant effects...This book focuses on artisanal and industrial spirulina production methods, detailing the different open and closed cultivation systems. We have explored the various stages of the process, from cultivation through to packaging, while specifying the factors influencing yield, such as pH, light and temperature. Finally, we determined the tests needed to ensure the quality of our spirulina to international standards.