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This book offers a simplistic but comprehensive overview of heterocyclic compounds. The first two chapters deal with introduction, nomenclature and significance of heterocyclic compounds. The subsequent chapters explicitly provide various methods of preparation and reactivity of three to seven membered heterocyclic compounds. The physical properties such as boiling point, melting point, dipole moment and pKa as well as spectral data (1H and 13C NMR) of three to seven membered heterocyclic compounds are included in respective chapters. Each chapter ends with questions and their answers or hints that illustrates the concept at hand. The mechanism of important reactions has also been included at the appropriate places. This book will be useful for professors of chemistry, researchers working in various laboratories and students preparing for competitive exams. 1. Introduction and Nomenclature 2. Importance of Heterocyclic Compounds 3. Three Membered Heterocyclic Compounds with One Heteroatom 4. Four Membered Heterocyclic Compounds with One Heteroatom 5. Five Membered Heterocyclic Compounds with One Heteroatom 6. Bicyclic Ring Systems Derived from Pyrrole, Furan and Thiophene 7. Five Membered Heterocyclic Compounds with Two Heteroatoms 8. Bicyclic Ring Systems Derived from 1,2-Azoles and 1,3-Azoles 9. Six Membered Heterocyclic Compounds with One Heteroatom 10. Bicyclic and Tricyclic Ring Systems Derived from Pyridine 11. Six Membered Heterocyclic Compounds with Two Nitrogen Atoms 12. Bicyclic Ring Systems Derived from Pyridazine, Pyrimidine and Pyrazine 13. Seven Membered Heterocyclic Compounds 14. Porphyrins