The fiber optic sensing technologies such as Distributed Fiber Optic system and Fiber Bragg Grating system have received increasing demands in the geotechnical and structural engineering applications. This paper outlines the benefits of the fiber optic sensing systems compared to the conventional sensing systems. The applications, installation and monitoring approaches, and the results of several case studies are also presented in this paper. This paper gives an overview over several industrial applications of the fiber optic strain sensing systems, such as deep foundation testing, tunnel monitoring, and bridge health assessment. © 2023 selection and editorial matter, Askar Zhussupbekov, Assel Sarsembayeva & Victor N. Kaliakin; individual chapters, the contributors.