CHEF2019 is the third edition of the Calorimetry for High Energy Frontier (CHEF) conference series that started in 2013 with the goal to address the calorimeters development at the energy frontiers in physics including the use of high granularity, dual readout, and time information. It also deals with the innovative concepts of calorimetry in nuclear, particle and astro-particle physics. Calorimeter concepts go beyond the detection aspects and therefore CHEF gives an important place to discuss energy reconstruction algorithms, simulation techniques, readout systems, and services in the calorimetry fields.