Proceedings: Workshop on Forward Physics and QCD at the LHC, the Future Electron Ion Collider, and Cosmic Ray Physics

These proceedings are the result of the fourth Workshop on Forward Physics and QCD at the LHC, the Future Electron Ion Collider, and Cosmic Ray Physics, held November 18-21 2019 in Guanajuato, Mexico. Previous meetings were held in Nagoya, Japan (2015, 2017), and Stony Brook, New York (2018).