Laser spectroscopy is an extremely useful tool for sensing and chemical analysis. Lasers, detectors, and mathematical analytical tools have advanced, increasing the sensitivity and selectivity of spectroscopic techniques and broadening their applications. Laser Spectroscopy for Sensing investigates these developments and how laser spectroscopy can be applied in a wide range of industrial, medical, and environmental applications. Part one introduces basic concepts of atomic and molecular processes, as well as the fundamentals of laser technology for controlling the spectral and temporal aspects of laser excitation. Furthermore, it explains measurement selectivity, sensitivity, and stability, database construction, and machine learning-based data analysis automation. Part two delves into laser spectroscopy techniques, such as cavity-based absorption spectroscopy and the use of photoacoustic spectroscopy to obtain absorption spectra of gases and condensed media. These chapters go over imaging methods that use laser-induced fluorescence and phosphorescence spectroscopies before moving on to light detection and ranging, photothermal spectroscopy, and terahertz spectroscopy.