Modern organic spectroscopy describes the four main methods used by organic chemists: UV/Vis spectroscopy, infrared (IR) spectroscopy, single-nucleus nuclear magnetic resonance (NMR), multinuclear NMR, and mass spectrometry (MS). It provides a brief introduction to the physical principles behind each method, explaining how molecules interact with electromagnetic radiation and how this information can be applied to determine precise chemical structures. The course includes simple descriptions of spectroscopic instruments and the use of single-nucleus and multinuclear NMR spectroscopy to differentiate structural isomers of organic compounds. It also entails a comprehensive study of fragmentation patterns for various classes of organic compounds subjected to mass spectrometric analysis. Each chapter concludes with problem sets to test students' understanding of organic spectroscopy.