This is the thirty-fourth Workshop in Particle Physics being held yearly at the Planibel Hotel of La Thuile, Aosta Valley. Due to the COVID-19 emergency, we had a last minute cancellation of 2020 edition. As the pandemia due to SARS-nCoV2 is still ongoing, the 2021 edition will be held in virtual mode during the week March 8-12. The format of our Workshop will be adapted to the media in order to facilitate the participation from remote

The sessions of Young Since Forum are reserved to PhD students, in both experimental and theoretical physics.