On behalf of the Brazilian Microwave and Optoelectronics Society (SBMO) and the Centre Tecnològic de Telecomunicacions de Catalunya (CTTC), we are honored to coordinate the “20TH SBMO/IEEE MTT-S INTERNATIONAL MICROWAVE AND OPTOELECTRONICS CONFERENCE – IMOC 2023”, to be held at the city of Castelldefels, Barcelona, Spain, on 5-9 November 2023. This traditional biennial event is consolidated as an important forum that gathers professionals, researchers, academics and students in the fields of RF telecommunications, microwaves, optical communication, electromagnetism and sensors.