The book "Pyroelectric Energy Harvesting" offers a comprehensive examination of the possibilities of energy harvesting through pyroelectric materials, particularly in the context of micro-generators. It highlights the use of time-varying temperatures as an energy source and analyzes the efficiency of various energy capture techniques. A special focus is placed on the use of linear pyroelectric materials, such as PVDF films, and the application of the Synchronized Switch Harvesting on Inductor (SSHI) method. Furthermore, the phase transitions of relaxor PZN-4.5PT single crystals are investigated to optimize energy conversion. The results show that the efficiency of the thermodynamic Ericsson cycle when utilizing ferroelectric-ferroelectric transitions is significantly higher than when applying linear properties. This specialized book is aimed at professionals and students engaged in innovative approaches to energy harvesting.