The book "Spectroscopic Instrumentation" provides a comprehensive introduction to the principles of spectroscopy, which are crucial for analyzing the light from cosmic objects, especially from great distances. It is aimed at both students of physics and astronomy, as well as amateur astronomers who wish to familiarize themselves with the fundamentals of spectroscopy and the design of spectrographs. The authors, Klaus Vollmann and Thomas Eversberg, explain the basic optical and mathematical concepts necessary for understanding how spectrographs work. The book covers both the theoretical and practical aspects of designing standard and echelle spectrographs, guiding readers through the necessary calculations. Additionally, topics such as data acquisition using CCD cameras and fiber optics, as well as the challenges of data reduction, are addressed. Finally, some key aspects of research on massive stars and spectropolarimetry as an extension of spectroscopy are discussed.