The objective of this course consists in presenting the state of the art and on-going developments in Multi-Beam Antennas (MBAs) and Beam-Forming Networks (BFNs). They find application in several fields including communications, remote sensing (e.g. radars, radiometers, etc.), electronic surveillance and defense systems, science (e.g. multibeam radio telescopes), RF navigation systems, etc. They may be installed on board satellites, airplanes, trains, buses, buildings, cars etc. MBAs and BFNs are becoming also fundamental elements in emerging MIMO, 5G and 6G communications. The course content is regularly updated by the organizers who are involved since more than twentyfive years in this domain. The course has been proposed in different International Conferences including EUCAP (from 2013 up to 2025), IEEE APS 2016, IEEE APS 2012, IEEE APS 2020, IMS 2016, EuMW (from 2014 up to 2020), IEEE APS2017, IMS 2018, IEEE PAST. Up to now the short course has been attended by more than 1350 participants.