This monograph has been designed to promote an interesting and innovative application of optical fiber sensor for measuring water turbidity. Optical System in Measurement of Water Turbidity: Design and Analytical Approach presents the theoretical and practical aspects of optical physics particularly those related to the interaction between light and matter. an essential knowledge in the development of turbidity meter. The central focus of this monograph is the elaboration on the development of electronics sensory system for water turbidity measurement. This monograph serves to enhance the applicability of optical fiber sensor in metrological analysis by establishing its application in the field of environmental science.