This Special Issue presents 36 papers selected from 11th International Conference on Computational Heat and Mass Transfer (ICCHMT 2018). The conference venue was Cracow, Poland. The Cracow University of Technology organized this edition on days May 21-24, 2018. The Conference partners were University of Calgary (Canada), La Sapienza University of Rome (Italy), ENS Paris-Saclay (France). The ICCHMT2019 Conference Pat-ronage includes The Committee of Thermodynamics and Combustion of the Polish Acade-my of Science, Republic of Poland Ministry of the Energy, Mayor of the City of Cracow Prof. Jacek Majchrowski. The ICCHMT Conference Series has been successfully organized for over 19 years in various countries including Cyprus, Brazil, Canada, France, China, Turkey, South Korea and Poland.